Defusing Bombs

A bomb will explode when its countdown timer reaches 0:00 or when too many strikes have been recorded. The only way to defuse a bomb is to disarm all of its modules before its countdown timer expires.

Example Bomb

Front

Side

Modules

Each bomb will include a certain number of modules that must be disarmed. With a few exceptions, each module is discrete and can be disarmed in any order.

Instructions for disarming modules can be found in Section 1. "Needy" modules present a special case and are described in Section 2.

Strikes

Strike Indicator

When the Defuser makes a mistake, the bomb will record a strike which will be displayed on the indicator above the countdown timer. Bombs with a strike indicator will typically explode upon the third strike. The timer will begin to count down faster after a strike has been recorded.

If no strike indicator is present above the countdown timer, the bomb will explode upon the first strike, leaving no room for error.

Gathering Information

Some disarming instructions will require specific information about the bomb, such as the serial number. This type of information can typically be found on the top, bottom, or sides of the bomb casing. See the appendices, most notably A, B and C, for instructions that will be useful in disarming certain modules.

On the Subject of Wires

Wires are the lifeblood of electronics! Wait, no, electricity is the lifeblood. Wires are more like the arteries. The veins? No matter…

• A wire module can have 3-6 wires on it.
• Only the one correct wire needs to be cut to disarm the module.
• Wire ordering begins with the first on the top.

On the Subject of The Button

You might think that a button telling you to press it is pretty straightforward. That’s the kind of thinking that gets people exploded.

See Appendix A for indicator identification reference.
See Appendix B for battery identification reference.

Follow these rules in the order they are listed. Perform the first action that applies:

1. If the button is blue and the button says "Abort", hold the button and refer to "Releasing a Held Button".
2. If there is more than 1 battery on the bomb and the button says "Detonate", press and immediately release the button.
3. If the button is white and there is a lit indicator with label CAR, hold the button and refer to "Releasing a Held Button".
4. If there are more than 2 batteries on the bomb and there is a lit indicator with label FRK, press and immediately release the button.
5. If the button is yellow, hold the button and refer to "Releasing a Held Button".
6. If the button is red and the button says "Hold", press and immediately release the button.
7. If none of the above apply, hold the button and refer to "Releasing a Held Button".

Releasing a Held Button

If you start holding the button down, a colored strip will light up on the right side of the module. Based on its color, you must release the button at a specific point in time:

• Blue strip: release when the countdown timer has a 4 in any position.
• White strip: release when the countdown timer has a 1 in any position.
• Yellow strip: release when the countdown timer has a 5 in any position.
• Any other color strip: release when the countdown timer has a 1 in any position.

On the Subject of Keypads

I'm not sure what these symbols are, but I suspect they have something to do with occult.

• Only one column below has all four of the symbols from the keypad.
• Press the four buttons in the order their symbols appear from top to bottom within that column.

On the Subject of Simon Says

This is like one of those toys you played with as a kid where you have to match the pattern that appears, except this one is a knockoff that was probably purchased at a dollar store.

1. One of the four colored buttons will flash.
2. Using the correct table below, press the button with the corresponding color.
3. The original button will flash, followed by another. Repeat this sequence in order using the color mapping.
4. The sequence will lengthen by one each time you correctly enter a sequence until the module is disarmed.

If the serial number contains a vowel:

If the serial number does not contain a vowel:

On the Subject of Who’s on First

This contraption is like something out of a sketch comedy routine, which might be funny if it wasn't connected to a bomb. I’ll keep this brief, as words only complicate matters.

1. Read the display and use step 1 to determine which button label to read.
2. Using this button label, use step 2 determine which button to push.
3. Repeat until the module has been disarmed.

Step 1:

Based on the display, read the label of a particular button and proceed to step 2:

YES	FIRST	DISPLAY	OKAY	SAYS	NOTHING
	BLANK	NO	LED	LEAD	READ
RED	REED	LEED	HOLD ON	YOU	YOU ARE
YOUR	YOU'RE	UR	THERE	THEY'RE	THEIR
	THEY ARE	SEE	C	CEE

Step 2:

Using the label from step 1, push the first button that appears in its corresponding list:

On the Subject of Memory

Memory is a fragile thing but so is everything else when a bomb goes off, so pay attention!

• Press the correct button to progress the module to the next stage. Complete all stages to disarm the module.
• Pressing an incorrect button will reset the module back to stage 1.
• Button positions are ordered from left to right.

On the Subject of Mazes

This seems to be some kind of maze, probably stolen off of a restaurant placemat.

• Find the maze with matching circular markings.
• The defuser must navigate the white light to the red triangle using the arrow buttons.
• Warning: Do not cross the lines shown in the maze. These lines are invisible on the bomb.

On the Subject of Passwords

Fortunately this password doesn't seem to meet standard government security requirements: 22 characters, mixed case, numbers in random order without any palindromes above length 3.

• The buttons above and below each letter will cycle through the possibilities for that position.
• Only one combination of the available letters will match a password below.
• Press the submit button once the correct word has been set.

On the Subject of Colour Flash

It’s easy to identify colours. Red, Blue, Green, etc. Turns out it's a bit harder when you display a word colour in a different colour though...

• A Colour Flash module will repeatedly flash a sequence of 8 different words representing colours in different colours.
• The possible colours are Red, Yellow, Green, Blue, Magenta and White.
• There is also a Yes button and a No button on the module.
• Only one of the Yes and No buttons need to be pressed to disarm the module, but must be pressed at the correct time according to the rules below.
• The colour of the last word in the sequence determines which set of rules to follow below.
• Follow the rules down from the top-most rule, down to the bottom-most rule for the block that applies to your module.

Continuation of previous table...

On the Subject of Piano Keys

What do you get when you drop a piano down a mine shaft? A flat minor.

See Appendix A for indicator identification reference.
See Appendix B for battery identification reference.
See Appendix C for port identification reference.
See Appendix Piano for piano/keyboard reference.

• A piano keys module will present with 3 musical symbols in the top indicator and a 12-note keyboard to input with.
• Each rule consists of one or more required symbol(s) and optional further requirements based on the bomb casing.
• Follow the list of rules down until one matches the criteria for the module; then execute the sequence of notes listed.
• A failed attempt will require re-entry of the entire note sequence.

On the Subject of Two Bits

This poorly programmed lookup device is as maddening with its slow responses as it is unforgiving with ill-timed inputs. Patience required.

Query a series of two-letter codes to track down the correct answer before submitting it. This primitive lookup machine is intolerant to incomplete and excessive inputs, as well as any input while it is busy.

Step 1: Determine Initial Code

If the serial number contains a letter, use the leftmost letter's numeric position in the alphabet as your base value (e.g. A=1, B=2). For no letters, use 0.

Add the last digit of the serial number multiplied by the number of batteries present.

If there is a Stereo RCA port present, double the current value.*

This value** is now the current code.

* Note: Skip this step if there is also an RJ45 port present.

** Note: Use the last two digits if the value is greater than 99. Prepend with a zero if less than 10.

Step 2: Determine character pair and Perform Query

Using the current code, look up the character pair. Enter that pair into the device and press "Query".

Step 3: Repeat and Submit

The response code from the device from the query in Step 2 is now your current code. Perform Step 2 an additional 2 times, using the new code each time.

After receiving the response code from the final query, look up the corresponding character pair, enter the pair into the device and press "Submit".

On the Subject of Anagrams

Randomly punching in the letters will eventually give me another word. One of the arrangements must work, right?

On the Subject of Sword

These letters are confusing. I think they're in the wrong order.

On the Subject of The Square Button

This may look like the button you know and love, but don't be fooled! It's a brilliantly disguised imposter foiled only by a single mistake: It's the wrong shape.

1. If the button is blue and the number of AA batteries is larger than the number of D batteries, hold the button and refer to "Releasing a Held Button".
2. If the button is yellow or blue and has as at least as many letters on the label as the highest number in the serial, press and immediately release.
3. If the button is yellow or blue and the label states a colour, hold the button and refer to "Releasing a Held Button".
4. If the button has no label, press and immediately release when the two seconds digits on the timer match.
5. If the button is not dark grey and the number of letters on the label is larger than the number of lit indicators, press and immediately release.
6. If there are at least 2 unlit indicators and the serial contains a vowel, press and immediately release.
7. If no other rule applies, hold the button and refer to "Releasing a Held Button".

Releasing a Held Button

• Cyan: Release when the two seconds digits add up to 7.
• Orange: Release when the two seconds digits add up to 3 or 13.
• Other: Release when the two seconds digits add up to 5.

• Cyan: Release when the number of seconds remaining is a multiple of 7.
• Orange: Release when the number of seconds displayed is either prime or 0.
• Other: Release one second after the two seconds digits add up to a multiple of 4.

On the Subject of Simon States

I'm not sure this even qualifies as Simon Says...

• One or more colours will flash per stage.
• Each stage will also show the colours of previous stages.
• The current sequence will repeat after a short delay.
• When the sequence repeats, your input is not reset.
• If you press an incorrect button, your input is reset.
• Using the table on the next page, press the correct colour for each stage to advance.
• When a rule asks for colour priorities, use the table below to determine the correct colour.

On the Subject of Round Keypads

I think someone tried to make this module look really cool, but failed.

• The circular keypad contains 8 symbols from the columns below.
• Find the column below that contains the most symbols from the keypad.
• If two or more columns have the most symbols, use the right-most column.
• Press all buttons that have a symbol not present on the correct column.

On the Subject of Listening

“Why did we send a deaf person to defuse a bomb?” — Person who is no longer alive.

Press the play button to play a sound clip through the speaker. Each sound clip has a corresponding code that contains any of the four symbols $ * & #. Match the sound clip to the table below and enter the code via the four button keypad.

Note: pressing play also clears whatever code you have entered.

On the Subject of Foreign Exchange Rates

If bombs were stock brokers...

Defusing this module requires the expert to have a device that can connect to the World Wide Web.

This module has the ability to connect to the internet and query the state of foreign exchange rates. There should be a three times three grid of keys, each with a light emitting diode. DO NOT PRESS ANY KEY ON THIS MODULE WHILE THE LIGHT EMITTING DIODES ARE FLASHING IN SEQUENCE.

The keys are grouped by rows:

All light emitting diodes have turned green:

Enter the following uniform resource locator into your internet capable device:
http://api.exchangeratesapi.io/latest?base=XXX&symbols=YYY
Replace XXX with the ISO 4217 alphabetic code for the base currency.
Replace YYY with the ISO 4217 alphabetic code for the target currency.
You will receive data in a Javascript object notation format, look for {"YYY": NUMBER}, where NUMBER will be the exchange rate. Using the exchange rate, convert the number in the bottom row to the target currency, round that number down and take note of the 2nd digit from the left[4]. Press the Nth key where N is the noted number (count keys from left to right, top to bottom)[5].

All light emitting diodes have turned red:

In this case the module failed to query today's currency rates. Get the ISO 4217 numeric code for the target currency's country and take note the 2nd digit from the right. Press the Nth key where N is the noted number (count keys from left to right, top to bottom)[5].

[1]: If there is more than one battery on the bomb, the base currency code and target currency code is swapped.
[2]: This may instead be the ISO 4217 numeric code.
[3]: Note the currency rates are updated around 4PM CET.
[4]: In the case the converted currency is less than 10, the noted number is 0.
[5]: In the case the noted number is 0, press the top left key.

See Appendix ISO 4217 for currency codes reference.

On the Subject of Morsematics

Get it? Because it uses morse and maths! I'll see myself out...

• Every letter of the alphabet is considered to have numeric value equal to its position (A=1, B=2 ... Z=26)
• Numeric values outside the 1-26 range wrap around (Z+1=A, 26+1=1)
• Three unique letters are being received on a loop, shown by the three flashing lights in the middle of the module
• To solve the module, a correct response letter must be sent in morse using the transmit button in the bottom-right
• The small switch at the top can be used to toggle the received letter lights

Transmitted morse is interpreted based on gaps between button holds.
Holding for more than double the length of the average gap is considered to be a dash, and anything shorter is considered a dot.
When transmitting, E and T are considered equal, as they are indistinguishable.

Take the 4th and 5th character of the serial number, this is your character pair.

Perform each step below in sequence, modifying your character pair progressively:

• For each indicator that has a matching letter in the received letters; add 1 to the first character of your pair if the indicator is on, or the second character if it is off
• If the sum of your character pair is a square number, add 4 to the first character; otherwise, subtract 4 from the second character
• Add the largest received letter to the first character in your pair
• If any received letters are prime, subtract them from the first character in your pair
• If any received letters are square, subtract them from the second character in your pair
• If batteries are present and any received letters are divisible by the number of batteries present, subtract those received letters from both characters in your pair

After performing all steps, perform whatever rule applies below:

• Characters are equal: Transmit the first character
• First character larger: Transmit the difference of the two characters
• Second character larger: Transmit the sum of the two characters

See Appendix Alphabet for alternative alphabet encoding reference.

On the Subject of Forget Me Not

This one likes attention, but not too much attention.

• The main display will update on each solved module*. The current display stage is shown on the smaller display.
• Add the displayed number to the corresponding number gained from the chart below, and record the least significant digit from the total. This is the calculated number for that stage.
• When all other modules* have been completed, the display will turn blank.
• Press the calculated numbers on the keypad in the order they were obtained.
• If an incorrect calculated number is entered, the button for the displayed number for that stage turns green.

On the Subject of Logic

Logic is easy, but logic AND bomb defusal might not.

• Each row displays 3 letters. Each letter represents a statement which can be found in table 1.
• On each row, solve the statements inside the brackets first.
• Statements are joined with logical connective symbols. Find how each symbol works in table 2.
• Apply negation (NOT gate: false becomes true and true becomes false) to each statement first if the red LED above that statement is lit.
• Find the end result of each row, and then use the T/F button to the right to select True/False. Press “Submit” when done.

See Appendix A for indicator identification reference.
See Appendix B for battery identification reference.
See Appendix C for port identification reference.

Table 1: Statement list

Table 2: Logical connective symbol list

On the Subject of Adventure Games

This appears to be a strange interface for an old text adventure game. All of the inventory management puzzles you have come to know and love, but none of the story.

• The three screens show the enemy you are facing, a list of statistics about your character and the world, and a list of the objects in your inventory.
• In your inventory is three weapons, plus five miscellaneous items.
• You must decide which of the items to use to prepare for the battle, then which weapon to use.
• Use the left and right arrows to scroll through statistics and inventory.
• To use an item or weapon, press “USE” when it is displayed in the inventory.
• Use the item table below to determine whether or not to use each item.
• Items can be used in any order, but all applicable items must be used before a weapon is used to fight the enemy.
• Use the weapon table and the enemy statistic table to determine which weapon to use to fight the enemy.
• For each weapon, compare the player’s relevant stat (STR, DEX, or INT), plus any bonus, to the enemy’s same stat.
• To defeat the enemy most efficiently, use the weapon which has the highest stat advantage (or lowest disadvantage).
• If two weapons have the same stat advantage, either can be used.

On the Subject of Turn The Key

How can something so simple be so infuriating?

Turn the key when the bomb's timer matches the time on the display, no sooner, no later.

On the Subject of Plumbing

I'd wash your hands after this one...

• The module has 4 input pipes (left) and 4 output pipes (right). At least one input pipe and one output pipe will be active.
• The defuser must connect all active input pipes to all active output pipes, whilst taking care not to connect inactive pipes, using the 6 by 6 grid of pipes. Clicking on a pipe in the 6 by 6 grid will rotate it.
• All pipes connected to an active pipe must also correctly connect to other pipes. Any pipe with a connection not going into another pipe (or going into an inactive in/out pipe) will cause a strike upon checking the solution.
• Once the solution has been entered, press “CHECK” to verify the solution. An incorrect solution will cause a strike.
• Active input and output pipes are determined using the table below. If the pipe has more points for it than against, it is active.

On the Subject of the Safety Safe

This safe either contains immense riches, or is empty.

• All 6 dials must be oriented correctly to solve the module.
• Each dial has a tell, where it clicks louder. This is the starting location for each dial.
• Follow the rules below to determine how far to rotate each dial after the starting location.
• Turn the lever to check the solution. Any correct dials are indicated with a green light, and any incorrect dials are indicated with a red light.

• Starting at 0, add the number of port types on the bomb, multiplied by 7.
• Add the number of lit indicators with a matching letter in the serial, multiplied by 5.
• Add the number of unlit indicators with a matching letter in the serial.
• For the first five dials, add the number obtained from the table on the next page, using both the location of the dial and the serial number as reference.
• For the last dial, add the sum of the numbers in the last column using all characters in the serial number as a reference.
• Note: A full rotation takes 12 turns.

On the Subject of Cryptography

WLMY ETGXFD EQCD ED PQKW WT CMFF EZYDFB.

SEE THE NEXT PAGE FOR AN EXCERPT OF "A CHRISTMAS CAROL".
SEE THE SUBSEQUENT PAGE FOR FREQUENT LETTERS AND WORDS.

This module will display ciphertext which contains a sentence from Charles Dickens' "A Christmas Carol" (aka the plaintext). The plaintext has been encrypted via a substituion cypher, meaning each letter in the alphabet is substituted for a different letter.

• The letter E will always mean the letter E.
• Apart from the letter E, no letter can substitute itself.
• All punctuation has been removed from the ciphertext.
• Above the display are five keys each with a letter that is found in the plaintext.
• Once the ciphertext is decrypted, press each key only once, in order that they appear in the plaintext.
• Entering the incorrect sequence will gain a strike, try the sequence again from the beginning.

NOTE: The meaning of the word colors is currently unknown, however you can safely ignore them.

Excerpt from Charles Dickens' "A Christmas Carol".

Word and Letter Frequency in Charles Dickens' "A Christmas Carol".

On the Subject of Chess

Under pressure, chess can feel more like a game of battleships.

This module is based on a 6×6 chessboard (referenced on the following page) and all figures follow the standard FIDE movement rules.

The chess module will present with a display and two rows of six buttons each.

• There are six unique coordinates that represent six positions on the chessboard.
• Use the numbered keys in the bottom row to browse through the different coordinates. A green LED below the button will indicate the position of the currently selected coordinate.
• Using the reference table below, each position can be assigned a certain chess figure.
• The chess figures will cover 35 of the 36 possible fields with their combined movesets.
• All chess figures are colorless but can block each other's movement.
• Find the one field that isn't covered by any of the chess figures and enter the coordinate to defuse the module.
• To enter the coordinate, press the letter first, then the number. The LEDs will turn red to confirm the input of a solution.

Use this table as reference to determine the correct figure for each position:

Chess Board Reference

Use the following graphic as a reference for the chess board layout.

On the Subject of Turn The Keys

Order is everything.

This module has two keys and a display. The display indicates this module’s priority.

LEFT KEY

Turn the left key after you have done all of the following:

• Turned the right key on all ‘Turn the Keys’ modules.
• Turned all lower priority left keys.
• Solved all Password modules.
• Solved all Who’s On First modules.
• Solved all Keypad modules.
• Solved all Listening modules.

But before you have done any of the following:

• Turned any higher priority left keys.
• Solved any Maze modules.
• Solved any Memory modules.
• Solved any Complicated Wires modules.
• Solved any Wire Sequence modules.
• Solved any Cryptography modules.

RIGHT KEY

Turn the right key after you have done all of the following:

• Turned all higher priority right keys.
• Solved all Morse Code modules.
• Solved all Wires modules.
• Solved all Two Bits modules.
• Solved all The Button modules.
• Solved all Colour Flash modules.
• Solved all Round Keypad modules.

But before you have done any of the following:

• Turned any left keys.
• Turned any lower priority right keys.
• Solved any Simon Says modules.
• Solved any Plumbing modules.

On the Subject of 3D Maze

You are in a maze of twisty passages, all alike. Exits are to the north, south, east, and west.

• The defuser starts in a random position and orientation in one of the ten mazes below.
• Locate the defuser using a 3D view of the maze walls, which also shows the symbol on the floor of the current space, and if there is a symbol in the space ahead.
• The maze map is cyclic; moving off one of the edges will take the defuser to the space on the opposite side, provided there is no wall in between the space.
• One of the walls is the goal, the rest will cause strikes if moved into.
• To defuse the module, locate the goal wall, and move through it from either side.
• Using the methods below, calculate a row (0-7), a column (0-7), and a direction; the goal wall will be the first wall from these coordinates in the given direction.

Row:

• Start with the first numeric digit in the serial number.
• Add 1 for every unlit indicator with a letter in “MAZE GAMER”.
• If the row number is greater than 7, subtract 8.

Column:

• Start with the last numeric digit in the serial number.
• Add 1 for every lit indicator with a letter in “HELP IM LOST”.
• If the column number is greater than 7, subtract 8.

Direction:

• Each maze contains three star icons marked on the map.
• On the floor in each of these locations is a letter, which maps to the direction to the goal wall: “N” becomes North, “S” becomes South, “E” becomes East, and “W” becomes West.
• Beware of letters not in these marked locations, they carry incorrect decoy instructions!

On the Subject of Silly Slots

Sassy Sally said sorry since soggy Steven slurped soup.

Only press the KEEP button when the slots are in a LEGAL state. Only pull the lever when the slots are in an ILLEGAL state. The module will automatically defuse after 4 pulls of the lever.

The slots are in an ILLEGAL state if any of these statements are true:

• There is a single Silly Sausage.
• There is a single Sassy Sally, unless the slot in the same position 2 stages ago was Soggy.
• There are 2 or more Soggy Stevens.
• There are 3 Simons, unless any of them are Sassy.
• There is a Sausage adjacent to a Sally, unless every adjacent Sally is Soggy.
• There are exactly 2 Silly slots, unless they are both Steven.
• There is a single Soggy slot, unless the previous stage had any number of Sausage slots.
• All 3 slots are the same symbol and colour, unless there has been a Soggy Sausage in any previous stage.
• All 3 slots are the same colour, unless any of them are Sally or there was a Silly Steven in the last stage.
• There are any number of Silly Simons, unless there has been a Sassy Sausage in any previous stage.

UNDERLINED words are placeholders, substitute them for the correct word using the matrix below and the keyword found on the module’s display. This keyword changes when the lever is pulled.

On the Subject of Skewed Slots

This has to be illegal somehow...

• A skewed slots module contains 3 numeric displays and a submit button on it.
• Based on the current display on the slots, submit the correct digits based on following sections of rules. Each section is labeled with which slot it applies to.
• After all the rules have been applied, if the number is below 0, add 10. Otherwise if the number is above 9, subtract 10. Repeat this until the number is between 0-9.
• If you submit the incorrect digits, the slots will automatically spin and a strike will be assigned.

On the Subject of Caesar Cipher

Communication was dangerous back in the days. Can you figure out what the original message was?

Decipher the characters on the display with the help of Caesar’s tactics. There’s no delete button, so press those buttons carefully!

For example: if the offset is -2, D becomes B and L becomes J. The table below can be used to calculate the required offset. If the offset column contains an = sign, that value should be used, regardless of other rules that apply.

On the Subject of Murder

This module is powered by the restless soul of a murder victim. The only way to disarm it is to solve the case so the victim can pass peacefully to the afterlife.

• Select the murderer, murder weapon, and location on the display panels and press "ACCUSE" to disarm the module.
  
• The module displays one location in red - this is the room in which the body was found. It is not necessarily the room in which the crime occurred.
  
• The table below shows the location of the suspects and potential weapons at the time of the murder. The murderer must have been in the same location as the murder weapon at this time.
  
• Some suspects and potential weapons have already been eliminated from the investigation - these are not listed on the module.

Suspects:

• If there is a lit indicator with label TRN, use row 5 to locate the suspects.
• Otherwise, if the body was found in the Dining Room, use row 7.
• Otherwise, if the bomb has 2 or more Stereo RCA ports, use row 8.
• Otherwise, if there are no D batteries on the bomb, use row 2.
• Otherwise, if the body was found in the Study, use row 4.
• Otherwise, if there are 5 or more batteries, use row 9.
• Otherwise, if there is an unlit indicator with label FRQ, use row 1.
• Otherwise, if the body was found in the Conservatory, use row 3.
• Otherwise, the suspects can be located using row 6.

Weapons:

• If the body was found in the Lounge, use row 3 to locate the weapons.
• Otherwise, if there are 5 or more batteries, use row 1.
• Otherwise, if the bomb has a serial port, use row 9.
• Otherwise, if the body was found in the Billiard Room, use row 4.
• Otherwise, if there are no batteries on the bomb, use row 6.
• Otherwise, if there are no lit indicators on the bomb, use row 5.
• Otherwise, if the body was found in the Hall, use row 7.
• Otherwise, if the bomb has 2 or more Stereo RCA ports, use row 2.
• Otherwise, the weapons can be located using row 8.

Locations:

On the Subject of Follow the Leader

Child’s play. Just follow the leader. Only if you fail to follow, the penalty is somewhat more explosive.

This module contains 8-12 wires connecting numerically labeled plugs in a looping sequence. Each wire leads from one plug to the next plug that contains a wire in ascending numerical order. A wire leading from plug 1 is considered to be “wire 1”.

Progress through the module by first determining the starting wire, then checking whether to cut each wire in the sequence. Each wire will need to be either cut or left uncut based on the state of the previous wire(s) in the sequence.

Determine Start Position

Follow the first rule below that applies:

1. If an RJ-45 port is present and there is a wire leading from plug 4 directly to plug 5, begin at that wire.
2. Otherwise, if there is a wire that begins at a plug matching the number of batteries on the bomb, begin with that wire.
3. Otherwise, if there is a wire that begins at a plug matching the first numeral of the serial number, begin at that wire.
4. Otherwise, if there is a lit indicator with the label CLR, disregard all further instructions and cut all wires present on this module in descending numerical order.
5. If none of the above apply, the start position is the plug containing a wire earliest in numerical order.

Cutting Wires

• Always cut the wire at the starting plug. Then progress to the next wire.
• From this position, cut the wires as directed by the steps in the following table. The starting step corresponds to the first letter in the serial number. If the serial number contains no letters, begin at step A.
• When progressing to the next wire, also progress to the next step alphabetically in the table to determine whether to cut the wire.
• “Previous wire(s)” may refer to wires beyond the original starting position in the sequence.
• If the wire at the starting plug is red, green, or white, progress through the steps in reverse alphabetical order instead.

On the Subject of the Blind Alley

What? Where?

The module appears blank, but has eight touch-sensitive regions laid out as in the following diagram. Touch the regions that have the most conditions met in any order.

On the Subject of Bitmaps

Over 18 quintillion combinations, only some of them actually matter.

• The module displays a bitmap of 64 pixels divided into four “quadrants”. Each pixel is bright (which we call “white” although it may be colored) or dark (“black”).
• There are 4 buttons underneath, labeled 1, 2, 3, and 4.
• In the following table, start at the rule whose number equals the last digit of the serial number
• Keep going through the rules (wrapping around if necessary) until you encounter a condition that applies.
• Calculate the answer for the applicable rule. Repeatedly add or subtract 4 until the answer is between 1 and 4 and press the corresponding button to disarm the module.

On the Subject of Third Base

This module is identical to Who's On First, except with four characters on each button instead of confusing words and phrases. This should be easy... right?

1. Read the display and use step 1 to determine which button label to read.
2. Using this button label, use step 2 determine which button to push.
3. Repeat until the module has been disarmed.

Step 1:

Based on the display, read the label of a particular button and proceed to step 2:

NHXS	IH6X	XI8Z	I8O9	XOHZ	H68S
8OXN	Z8IX	SXHN	6NZH	H6SI	6O8I
NXO8	66I8	S89H	SNZX	9NZS	8I99
ZHOX	SI9X	SZN6	ZSN8	HZN9	X9HI
	IS9H	XZNS	X6IS	8NSZ

Step 2:

Using the label from step 1, push the first button that appears in its corresponding list:

On the Subject of Souvenir

Something to remember your explosion by.

The module asks questions about the state of other modules that you solved prior. Answer all the questions correctly.

What you need to know:

See Appendix Souvenir for required information reference.

On the Subject of Word Search

LZIEAJDHARDERBNCOJWTHANPQIEYBZITLOOKSYWH

A field of 36 letters will appear on the screen within the module. Some of these letters will spell out words, which may be spelled backwards and appear in any direction.

1. The chart below contains boxes with letters in the corners. For each of the four letters in the corners of the display, find a box on the chart that has that letter in the same corner.
2. Once all the relevant boxes have been located, use the last digit of the serial number (even or odd) to determine the correct words to reference.
3. Only one of those words will appear on the display. Select the first and last letter of the correct word to disarm the module. The bomb will record a strike if any other words are selected.

On the Subject of Broken Buttons

How did they get invisible ink to even work like that?

• A broken buttons module will have 2 submit buttons at the top of it and 12 buttons below them.
• Depending on the 12 buttons, follow the first rule that applies.
• Repeat the rules until it tells you to press the correct submit button, which will defuse the module.
• Every time a button is successfully pressed, the button's text will change.
• If the defuser presses an incorrect button, it will give a strike.
• By default the correct submit button is the left one.
• After successfully pressing 5 buttons, press the correct submit button.

Rules:

On the Subject of Laundry

Sorting and folding are the least of your worries.

All the messes from the previous explosions must be cleaned up. Using the Laundry Symbol Reference L4UHDR9 and the rules below, determine the correct setting on the machine panel. Once satisfied, insert a coin. On error, a sock will be lost, and a strike gained.

Determine the piece of clothing that has to be cleaned with the tables below. For all values higher than 5, subtract 6 from the total until the new number is less than 6. For all negative values, add 6 until you have a value between 0–5.

• The Clothing Item (table L41) is determined by the number of unsolved modules (excluding needy modules) + total amount of indicators.
• The Item Material (table L42) is determined by the total number of ports + the number of solved modules – battery holders.
• The Item Color (table L43) is determined by the last digit of serial number + batteries.

Use washing instructions based on the material, drying instructions based on the color, and use ironing and special instructions based on the item. But, prioritize the following rules from top to bottom:

• If the color is Clouded Pearl ALWAYS use non-chlorine bleach.
• If the item is made out of leather, or in the color Jade Cluster, it can’t go above 120°F. To be safe ALWAYS wash at 80°F.
• If the item is a corset or the material is corduroy then use special instructions based on material.
• If the material is wool or the color is Star Lemon Quartz ALWAYS dry with high heat.
• If a letter of the clothing material matches a letter in your serial code, then the color takes over the special instructions.
• BUT if there are exactly 4 batteries in 2 holders and a there is a lit BOB indicator, ignore all other rules. Bob did the work for you. Just throw in the coin. Thanks BOB.

Input the solution through putting The Washing Symbol top-left, The Drying top-right, Ironing on the top display and Special on the bottom display.

Table L41: Clothing Item Reference

	CLOTHING ITEM	WASHING	DRYING	IRONING	SPECIAL
0	Corset	140°F	Dry Flat	2 dots
1	Shirt	105°F		No steam	No Tetrachlorethylene
2	Skirt	30°C	Hang To Dry		Reduced Moisture
3	Skort		Tumble Dry	3 Dots	Circle Top Left
4	Shorts	Do Not Wring	Shade	150°C
5	Scarf	95°C	Dry		Do not Dry Clean

Table L42: Clothing Material Reference

	CLOTHING MATERIAL	WASHING	DRYING	IRONING	SPECIAL
0	Polyester	50°C	No Heat	2 dots
1	Cotton		Medium Heat	Iron	Do Not Dry Clean
2	Wool	Handwash		390°F	Reduced Moisture
3	Nylon	30°C	Drip Dry		Low Heat
4	Corduroy	105°F		110°C	W
5	Leather	Do Not Wash	Do Not Dry	Do Not Iron

Table L43: Clothing Color Reference

	CLOTHING COLOR	WASHING	DRYING	IRONING	SPECIAL
0	Ruby Fountain	140°F		Do Not Iron
1	Star Lemon Quartz		Dry Flat	Iron
2	Sapphire Springs	80°F	Tumble Dry
3	Jade Cluster	30°C		300°F
4	Clouded Pearl		Low Heat	No steam
5	Malinite	60°C	Medium Heat

Laundry Symbol Reference

machine wash permanent press	machine wash gentle or delicate	hand wash	do not wash	30°C or 80°F	40°C or 105°F	50°C or 120°F	60°C or 140°F
70°C or 160°F	95°C or 200°F	30°C or 80°F	40°C or 105°F	50°C or 120°F	60°C or 140°F	70°C or 160°F	95°C or 200°F
do not wring	tumble dry	low heat	medium heat	high heat	no heat	hang to dry	drip dry
dry flat	dry in the shade	do not dry	do not tumble dry	dry	iron	do not iron	110°C 230°F
150°C 300°F	200°C 390°F	no steam	bleach	do not bleach	non-chlorine bleach	dryclean	any solvent
any solvent except tetrachlor­ethylene	petroleum solvent only	wet cleaning	do not dryclean	short cycle	reduced moisture	low heat	no steam finishing

On the Subject of Battleship

FIRE! ... (splash) Missed.

Attention, Cadet. We’ve narrowed the enemy’s locations to within this 5×5 grid. The targets in this area are concealed, but we do have a fair bit of intelligence on them.

We suspect this information may not be enough to determine with accuracy where the enemy forces are deployed. This is where you come in. We need you to figure out which locations within the battle arena we can safely survey without being seen:

• Take the first letter and the first digit of the serial number. Add or subtract 5 to the letter or digit until it is in the range A–E or 1–5. This is the first safe location.
• Do the same for the second letter and the second digit. Keep going until you run out of either letters or digits.
• Finally, convert the number of ports into a letter A–E and the number of indicators plus batteries into a digit 1–5 in the same manner. This is your final safe location.
• In each case, the letter indicates columns (left to right), the number indicates rows (top to bottom).

Attention, Ensign. We need you to ascertain the locations of all enemy vessels. When you have done so, the module is disarmed. The following tools are at your disposal:

• Survey the safe locations by using the radar tool. Using the radar on any unsafe location reveals our position to the enemy, so don’t do that.
• Use the water tool to mark locations that definitely have no enemy vessel in them. You may also click the number above a column or beside a row to mark every unmarked location in that row/column as water.
• Use the torpedo to attack the enemy. Do not waste torpedos on water!

Our intelligence indicates that:

• Every enemy ship is either horizontal or vertical.
• None of the vessels are directly adjacent, not even diagonally.
• We know how many squares in each row and each column have a piece of a ship in them. This is indicated by the numbers along the edges of the grid.
• We also know how many ships of each size there are. This is indicated by the symbols below the grid.

Good luck. Make us proud.

On the Subject of Double-Oh

A module, please. Shaken, not stirred. Stupid piece of junk; broken display, broken buttons...

• A display is shown with a two digit number, as well as five buttons. Using the buttons, toggle the display to 00 (located in the center of the below table), then hit the submit button.
• Four of the five buttons toggle the number in the display. Based on the table below, consisting of a 3×3 grid of smaller 3×3 grids, the buttons will behave in the following fashion:
• The “↕” button moves to the next position up or down within the current smaller grid, looping if reaching the edge (example: 00 to 85 to 14 to 00)
• The “↔” button moves to the next position left or right within the current smaller grid, looping if reaching the edge (example: 00 to 56 to 21 to 00)
• The “⇕” button moves to the same position in the next large 3×3 grid up or down, looping if reaching the edge (example: 00 to 22 to 58 to 00)
• The “⇔” button moves to the same position in the next large 3×3 grid left or right, looping if reaching the edge (example: 00 to 44 to 65 to 00)
• The “▣” button is the submit button. Pressing it will disarm the module if 00 is displayed and cause a strike otherwise.

NOTE: This module is old, and the last digit glitches out when the first digit is zero. In addition, the wiring for the buttons is acting up, so the functions of the buttons may be swapped. Fortunately, the strikes from the submit button are only registered by the bomb if the displayed number is less than 10.

On the Subject of Neutralization

The rules are simple: neutralize or be neutralized.

• The module is disarmed by successfully neutralizing an acid contained in a tube by titrating it with a chemical base.
• In order to solve the module, the type of base, amount of base, and filter state must all be correct.
• Once the appropriate conditions are set, press “Titrate” to confirm the solution.
• An incorrect input yields a strike. The correct answer remains unchanged.
• Useful info may be found in the Chemical Information tables.

Determining Titrants

The acid type can be determined using the following chart:

The base that must be used to titrate can be determined via the following ruleset:

• If the bomb has an NSA indicator and exactly 3 batteries, add ammonia.
• Otherwise, if the bomb has a lit CAR, FRQ, or IND indicator, add potassium hydroxide.
• Otherwise, if the bomb has no ports and the serial number has a vowel, add lithium hydroxide.
• Otherwise, if the acid's chemical formula has a letter in common with an indicator present on the bomb, add potassium hydroxide.
• Otherwise, if the number of D batteries is greater than the number of AA batteries, add ammonia.
• Otherwise, if the anion's atomic number is less than 20, add sodium hydroxide.
• Otherwise, add lithium hydroxide.

Determining Concentrations

The concentration of the acid can be determined via the following process:

• Start with the atomic number of the anion of the acid.
• Subtract the atomic number of the cation of the base.
• If the anion or cation has a vowel in the chemical symbol, subtract 4.
• If the anion and cation's chemical symbols have the same number of characters, multiply by 3.
• Take the least significant digit of the result (removing negative signs).
• If the number is 0, the number becomes the volume of acid doubled then divided by 5.
• Divide by 10. This is the concentration of the acid.

The concentration of the base can be determined via the following ruleset:

• If there are more battery holders than port types and more battery holders than indicators, the concentration is 5.
• If there are more port types than battery holders and more port types than indicators, the concentration is 10.
• If there are more indicators than battery holders and more indicators than port types, the concentration is 20.
• If there is a tie for the most, the concentration is either 5, 10, or 20, whichever is closest to the cation's atomic number.
• However, if the titration combination is HI and KOH or HCl and NH₃, the concentration is always 20.

Determining Drop Count

• Start with 20 and divide by the concentration of the base.
• Multiply by the volume of acid and concentration of the acid.
• The result is the number of drops required to successfully titrate.

Determining Solubility

• If the module’s acid/base combination on the following chart has “NS” for “Not Soluble”, the filter must be turned ON before the base is added.
• Otherwise, the filter must be turned OFF.

Chemical Information

Bases

Acids

On the Subject of LED Encryption

Ooooh, shiny lights and buttons. Touchy touchy!

• Two to five LEDs are installed at the top of the module, representing stages. To disarm the module, these stages must be solved in order.
• Four buttons with four different letters are shown. The letters change at each stage.
• The current stage is indicated by a number in the top left of the module.
• The current stage’s multiplier is indicated by that stage’s LED according to the following table:

  Red	Green	Blue	Yellow	Purple	Orange
  2	3	4	5	6	7

• Assign each letter of the alphabet to the numbers 0–25 (A = 0, B = 1, C = 2, etc.).
• A button is correct if its letter value, multiplied by the current stage’s multiplier, modulo 26, is equal to the value of the letter on its diagonally opposite button.
• At each stage, press a correct button. There may be more than one possible answer.

On the Subject of Yahtzee

When has bomb defusal ever been a game of chance?

There are five dice in the colors of purple, yellow, blue, white and black. Start by rolling the dice. Then choose which dice to keep and which to reroll. You may only keep dice of the same value. Keep repeating this process until you get a Yahtzee.^*

At each stage, the dice to keep are given by the following rules:

If you just rolled 5 dice:

Follow the first rule that applies:

• Large straight:^* keep the die with the highest value equal to a digit in the serial number; if none, keep the purple.
• Small straight:^* keep the outlier.^*
• Three of a kind or full house:^* keep the white die if there are ≥ 2 lit indicators; otherwise, the black die if there are ≥ 2 unlit; otherwise, the highest value not in the three-of-a-kind.
• Four of a kind or two pairs: keep any dice matching the number of batteries; otherwise, matching the number of battery holders; otherwise the yellow die.
• Pair: keep the die of the color listed in the first applicable row of the following table:

  If there is a...	Die color
  parallel port	purple
  PS/2 port	blue
  RCA port	white
  RJ port	black
  otherwise	yellow

• Otherwise: you must roll all the dice again.
• In all of the above cases, dice of the same value as a die to be kept may also be kept.