bad idea i had on the way to work: pvp sudoku. kinda like tetris 99, clearing a puzzle applies a debuff to the target's current puzzle (like scrambling the numbers in a solution-preserving way or replacing them all with symbols) or next puzzle (increasing the size or difficulty of the puzzle they get after clearing this one). first to X puzzles solved wins
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or maybe it's like a samurai sudoku sort of deal - an attack adds a new grid conjoined to the current puzzle where the overlapping numbers are shared. maybe that's too much tho
