LABS
16-Clue Sudoku
The Sudoku with no unique solution
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ヒントは16個だけ。唯一解はない——ルール違反なく全部埋めれば、どの埋め方でもクリア。
A uniquely-solvable Sudoku needs at least 17 clues, so 16 always has many solutions — any rule-valid filling clears it. The in-game UI is in Japanese.
