On the Subject of Ten Choose Eight

What... is your favourite colour? Green. No.

More Tips for More Success

  • Enter four 4-digit codes into the module with the buttons. The first code you enter has a "sequence number" of 1, the second has a sequence number of 2, etc.
  • There are 4 flashing LEDs. Each is assigned a "key". One will be flashing Morse code, one will be flashing tap code, one will flash a sequence of 5 colors, and the last will produce 1–7 regular flashes.
    • The keys of the Morse and tap code LEDs are their translated letters.
    • The key of the LED flashing colors is the first letter of the name of its 5th flashing color. This will be called the Color Keys
    • The key of the remaining LED is obtained by indexing into the sequence R G B M C Y W by the number of flashes produced.
  • The LED giving the color key flashes the colors assigned to each sequence number in order, ignoring the last flash.
  • Assign keys to each sequence number by starting with the key given by the color key and proceeding downwards, wrapping around.
  • Use the below instructions to obtain the code to enter for each sequence number.
  • The number in the code represent the buttons ordered from top to bottom.
  • Once each code has been obtained, shift each of the presses a number of buttons down equal to one fewer than the sequence number, wrapping around.


List R

  • Parallel
  • RJ-45
  • Serial
  • Stereo RCA
  1. Take this sequence's key's alphabetic position and add the number of ports on the bomb in List R
  2. Use the rightmost two digits of this number, prepending with a zero if the number is less than ten.
  3. Reference both of these digits in the below table with the sequence number as the column to obtain the correct code to enter.
1 2 3 4
Both Even 2313 4231 2233 1231
1 Odd, 1 Even 1423 2314 4123 1231
Both Odd 1423 4231 4123 2341

1 2 3 4
3241 1122 4332 1231

Table L

0 1 2 3
0 x . . .
1 . x x .
2 . x x x
3 . . x x


  1. Take the code corresponding to the sequence number.
  2. Take this sequence's key's alphabetic position. If this number is less than ten, prepend a zero.
  3. Add the number of G's and 7's in the bomb's serial number to each digit, and take each modulo 4.
  4. Reference both of these digits into Table L (order does not matter). If the cell contains an x, reverse the code. Otherwise, submit it as it is.

Table B

1 1234 1243 2134 2143 3124
2 3142 1324 1342 1423 1432
3 4123 4132 2314 2341 3214
4 3241 2413 2431 4213 4231
5 3412 3421 4312 4321 1234


  1. Take this sequence's key's alphabetic position, and subtract 5 until its value is 5 or less. This is the starting row.
  2. Take the first letter in the serial number which is from A–E as the starting column. If no such letter exists, use the letter with the same alphabetic position as the starting row.
  3. Find the direction which you can travel the farthest without hitting a wall. Ties are broken north going clockwise.
  4. Move in this direction a number of spaces equal to the number of AA batteries. If you encounter a wall, stop moving.
  5. Repeat steps 3 and 4, but ordering south going clockwise, and travelling by the number of D batteries. Use the code you land on.

Grid M



  1. Find this sequence's key in Grid M. Also find the first 4 characters, converting numbers to the letters using 0=A, 1=B, etc. If any letters are Z, change them to A.
  2. Find the length of the shortest path using only orthogonal steps between the key and each serial number character in order.
  3. Take the 4 resulting lengths in the order they were obtained and add or subtract 4 from each until they are within 1–4. This sequence is the code.


  1. Take the alphabetic position of this sequence's key and subtract 7 until it is equal to 7 or less. Use the color at that position of the list:
    Red, Green, Blue, Magenta, Cyan, Yellow, White.
  2. Take every color LED on the module besides this LED and add the color obtained from the key.

    Grid C

    1234 1334 1334 4234 4334
    1223 1323 1323 4223 4323
    1231 1331 1331 4231 4331
    1224 1324 1324 4224 4324
    1214 1314 1314 4214 4314
  3. Begin in the top-left cell of Grid C. For each color in this list...
    • If the color is Red, Green, Blue, or White, move one cell to the right.
    • If the color is Cyan, Magenta, Yellow, or White, move one cell down.
  4. Use the code at the resulting position.


  1. Begin with the code 4123.
  2. Cycle the sequence to the right a number of times equal to the sequence number.
  3. If this sequence's key letter is A, B, C, X, Y, or Z, cycle the sequence to the left one additional place.


  1. Perform any other color's calculations using this sequence's key. Any of the resulting codes will be accepted.