On the Subject of The Missing Letter

I wonder where it went… Maybe it needed to go P? Maybe it went to find a new golf T? Or maybe it just wants to find U.

  • This module consists of a 5×5 grid of letters. Every letter of the English alphabet should be present except one.
  • Find the letter that’s not present on the module and perform the calculation in Table A to get a number. Take this number’s absolute value modulo 5 and add 1 to it. This number will be called n.
  • Find the nth word in Table B under the missing letter on the module and spell it out using the buttons to disarm the module.
  • If an incorrect letter is pressed at any time, a strike will be issued and the module will clear any input it has received so far.
Missing
letter
Calculation Missing
letter
Calculation
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z

B = number of batteries; BH = number of battery holders; P = number of ports; PP = number of port plates; I = number of indicators; LI = number of lit indicators; UI = number of unlit indicators; S# = serial number character in the #th position (A=1, B=2, ... Z=26); A# = alphabetic position of the #th letter on the module in column reading order (A1-5, B1-5, etc.)

Missing
letter
Word list Missing
letter
Word list Missing
letter
Word list
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z