Sudoku Expert Online

Three sudoku modes in one game: classic 6×6 for quick warm-ups, classic 9×9 from easy to expert, and Killer Sudoku with cage sums — a real challenge for puzzle lovers. 140 levels with increasing difficulty, a daily challenge, and smart tools: pencil marks with auto-cleanup, unlimited undo, conflict highlighting, and same-number tracking. In Killer mode, a built-in helper shows the remaining sum and possible digits for each cell. Earn stars, complete daily challenges, unlock achievements and color themes. Progress syncs across devices.

How to Play

Tap an empty cell, then pick a digit from the panel below. Fill every cell so that each row, column and block contains no repeated digits. In Killer mode there are no given digits — use the cage sums as clues. Digits within a cage must also be unique. Use Notes mode (✎ button) to pencil in candidates. The ↶ button undoes your last move.

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