Very sneaky noticing this pattern in the answers.
Numbers with prime factors 2, 3 and 5.
Stuff the Board
Cell Counting: How Many Draws?
Binary code (array)
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Lights Out 12 - 5x5, three stages, <7 moves
Divisible by 16
Word Distance - Average Sort
Combined Ages 1 - Symmetric, n = 3
Lights Out 13 - 5x5, three stages, x moves
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