Barry and Chris (not Alex and Chris)
Thanks for the catch. I've updated the explanation.
Remove all the words that end with "ain"
Solve the set of simultaneous linear equations
Remove the two elements next to NaN value
Draw 'O' !
Calculator spelling - Letters to Numbers
Lights Out 13 - 5x5, three stages, x moves
Scrabble Scores - 3
Lights Out 10 - 5x5, with wrapping, 6 moves
Lights Out 9 - 5x5, light-only solution? II
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