Sudora Sudoku

Sudora is a clean, focused sudoku game for iPhone. No account, no setup — open it and start solving.

FIVE DIFFICULTY LEVELS Easy, Medium, Hard, Expert, and Master. Each level starts you with fewer given clues than the last, from a gentle 45 down to a demanding 24. Every board is generated fresh and is guaranteed to have exactly one solution — there is always a path through by pure logic, never a guess.

PENCIL NOTES Switch on Notes to mark candidate numbers in a cell, just like you would on paper. Tap a digit to toggle it on or off. Notes never count against you, and writing a real number clears them automatically.

A BOARD THAT HELPS YOU SEE Select a cell and Sudora highlights its row, its column, its 3×3 box, and every other cell holding the same number. Duplicate entries light up in red the moment they break a rule, so a slip never hides for twenty moves.

THREE MISTAKES Enter a number that doesn't match the solution and it counts as a mistake. Three ends the game — but the board is kept, and you can take the same puzzle on again from the start.

NEVER LOSE A GAME Every move saves instantly. Leave mid-puzzle, close the app, restart your phone: the Continue list on the home screen holds your unfinished boards with their progress and elapsed time, ready to resume with one tap. Failed puzzles stay there too, waiting for a rematch.

THOUGHTFUL DETAILS • A timer that runs while you solve and stops when you finish • A number pad that dims each digit once all nine are placed • Full VoiceOver support — every cell announces its position, value, and state • Light and dark mode, following your system setting • Works entirely offline

Sudora asks nothing of you: no sign-up, no profile, no daily streak to protect. Just a grid, nine numbers, and however long you want to spend with them.