Sudoku Online

Sudoku Puzzle is a free online Sudoku game. No registration, play instantly in your browser. The classic mode offers four difficulty levels: Easy for beginners, Medium for steady practice, Hard for experienced players, and Expert for those who seek a real challenge. Additional game modes expand the standard rules: X-Sudoku adds diagonal constraints, Windoku introduces extra regions on the grid, Killer Sudoku requires groups of cells to meet a target sum, and Kropki adds ratio and difference markers between adjacent cells. Every puzzle has exactly one solution, reachable through pure logic — no guessing required. If you get stuck, a step was missed somewhere, and it can always be traced back. Sudoku Puzzle is also a competitive experience. Leaderboards track rankings by level, score, and wins. Personal profiles store game history and detailed statistics. The chat lets players connect, share strategies, and challenge each other.

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Sudoku

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