"There's some Sudoku books, although I think... No, they're all solved."
Bill Lee[src]

Sudoku was a puzzle-based activity from Earth.

Lt. Colonel John Sheppard had some sudoku books in his living quarters. (SGA: "The Return, Part 1")

The quarters in the former Midway space station also had sudoku books, but they were all solved. (SGA: "Midway")

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