On the Subject of Forget Me Not

When a toddler constantly seeks attention, we can end up throwing a tantrum too.

  • Record the bottom display’s digit at each stage.
  • The stage starts at 1 (shown on the smaller display), and increments when solving a non-ignored module.
  • For each stage, use the corresponding table below to determine its modifier, and add that with its digit (modulo 10) to get a sum.
  • After the last stage, begin at stage 1, and press the button equal to the sum you calculated for each stage.
  • Pressing the wrong button for a given stage will light the button with the stage’s original digit in green.
Stage 1 Modifier
unlit CAR2
#unlit > #lit7
#unlit = 0#lit
L# in S#
Stage 2 Modifier
SER≥3# in S#3
p. sum evenp. sum + 1
p. sum - 1
Stage 3+ Modifier
either p. sums = 0M# in S#
both p. sums evenSO# in S#
MSD of sum of p. sums
Key
#number, number of, digit
L# in S#the last digit of the serial number.
M# in S#the largest value digit in the serial number.
SO# in S#the smallest odd digit in the serial number,
or 9 if all digits are even.
≥3# in S#The serial number has 3 or more digits.
SERA serial port exists on the bomb.
p. sumThe previous stage’s sum (modifier + digit)
p. sumsThe two previous stages’ sums (modifier + digit)
MSD of sum of p.sumsAdd the two previous stages’ sums (not modifiers
or digits) together. If ≥10, the MSD is 1 instead.

Examples:

S# 5A3UL2, lit CAR, SER
Stages123456
Digits952158
Modifiers135193
Sums087241
S# 2JYMD4, no indicators
Stages123456
Digits947171
Modifiers081944
Sums928015