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Sudoku — clean, fast, offline.
Type the clues you want, then check the puzzle.
A tier is set by the hardest technique its boards actually need — each one adds a new idea on top of everything below it. Every puzzle also carries a rating for total solving effort, so you can tell a gentle Expert from a brutal one.
You reached 3 mistakes.
Anyone with the link can play it. Puzzles are checked and rated on the server before they go up.
Paste 81 characters — digits for clues, and 0 or . for the blanks.
Generate a puzzle to edit — a quick way to begin, and it replaces whatever is in the grid.
Pick a difficulty — your friend gets the same board, same rules. First to solve wins.
Joining challenge ----
Waiting for your friend to join…