Find the sum of the elements in the "second" diagonal
Back to basics 21 - Matrix replicating
Who has power to do everything in this world?
Predicting life and death of a memory-less light bulb
Extra safe primes
Scrabble Scores - 5
Divisible by 4
Lights Out 11 - 5x5, with wrapping, x moves
Lights Out 15 - 5x5, broken buttons I
Divisible by 2
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