Enter numbers 1–4 to play sudoku. Yes, seriously. Normal sudoku rules apply, just with a (not very challenging) 4x4 grid and 2x2 subgrids instead of the usual 9x9 and 3x3.
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it now dawns on me that you could just use the clues to set the initial board state and force a unique solution, meaning even a 9x9 would be tractable lol... but i'm happy putting a stop to this here :)