Sudoku Proof: Daily Logic

Every move has a reason.

Sudoku Proof is a clean, private Sudoku built for uninterrupted play and real learning. Start a puzzle instantly, finish it offline, and understand the logic when you want help. There are no ads, no account, no lives, and no subscription.

PLAY A COMPLETE SUDOKU
- Unlimited Easy, Medium, and Hard puzzles
- A shared Daily Challenge, including Expert and Master days
- Pencil notes with automatic cleanup
- Unlimited undo and redo
- Optional error checking and a timer you can hide
- Automatic local saving after every move
- Light and dark appearance on iPhone and iPad

LEARN THE REASON
Basic reveals help you finish without buying hint packs. Pro adds visual Logic Proofs that highlight the exact candidates, units, and eliminations behind the next step. Practice Singles, Locked Candidates, Pairs, Triples, X-Wing, Skyscraper, XY-Wing, and Swordfish.

BRING YOUR OWN PUZZLE
With Pro, type or paste an 81-cell puzzle, check whether it has one solution, see its difficulty, and solve it step by step.

ONE PURCHASE, NO SUBSCRIPTION
Pro includes every answer and all Pro features. One-time purchase. No subscription. Three sample answers per category are free to view again. Unlock Pro for all remaining answers. Existing answer-pack purchases can still be restored for their original difficulty.

PRIVATE AND OFFLINE FIRST
Your active game and history are stored locally. Private iCloud sync and Game Center are optional Apple services; either can be unavailable without stopping play or losing the local result.