On the Subject of Not The Fan

Don’t blow my cover!

• The lower button submits a Morse dot (.) and the upper a dash (-)
• When the first correct input is made, the display will go blank.
• An incorrect input will cause a strike and reset the module with a new initial word.
• When a word is correctly submitted, a green LED is lit on the display.
• Solve the module by lighting all three LEDs and submitting the final word.

Step 1: Submitting the First Word

The display shows the first word to submit with up to two letters replaced by numbers (e.g., “AnG13” for “ANGLE”). Convert each character to Morse code and submit using the buttons. After each letter, note the fan’s state.

Step 2: Determining Subsequent Words

Use the fan’s state after each of the letters in the previous word's submission to determine the next word:

Convert the first three fan states to digits using the table on the right. Concatenate them to form a ternary number. Convert to decimal and find its letter (A=1, Z=26). This is the first letter of the base word. Find the word starting with this letter in Table 1. The last two fan states determine which letters are replaced by numbers:

• If the fourth state is clockwise, the first replaceable letter is replaced by a number.
• If the fifth state is clockwise, the second replaceable letter is replaced by a number.

Use Table 2 to identify which letters can be replaced and Table 3 to find their replacements. Submit the modified word in Morse. Repeat this step until three LEDs are lit on the display.

Step 3: Final Word

Once three LEDs are lit, collect all numbers from the submitted words. For each number n, calculate 3(n+1), sum the results and subtract 26 until the value falls in the range 1-26. Find the base word in Table 1 starting with the letter corresponding to this value (A=1, 26=Z). Take 0 to be Z. Submit this word with no number substitutions to solve the module.

Table 1: Base Words

Table 2: Replaceable Letter Positions

Each cell lists letters corresponding to the first letter of a word from Table 1. A letter appears in two cells total, the columns of these cells indicate the two letter positions which numbers may replace.

Table 3: Letter to Number Mapping

Appendix 1 - Fans