A new puzzle every day
Four puzzles each morning across every difficulty, plus twenty more each week. The archive keeps every past puzzle, ready to revisit.
Tetsudoku
Smart hints, fresh puzzles.
Four fresh Sudoku puzzles arrive every morning — one each of Easy, Medium, Hard, and Expert. Stuck on a move? Most apps hand you the answer. Tetsudoku shows you the next logical step and teaches you the strategy behind it.
Coming soon · iPhone & iPad · Free to play · Available in 9 languages
Everything you need to solve smarter
Hints that teach
Tetsudoku shows the next logical step, names the cells involved, and explains the strategy behind it — so you need fewer hints over time.
Learn fifteen strategies
From naked singles to X-Wings and Swordfish — each strategy comes with a full explanation and practice puzzles to master it.
No penciling by hand
Candidates are tracked automatically. Tap to highlight every cell that can hold a digit, or find cells with exactly two candidates in one tap.
Bring your own puzzle
Spotted a puzzle in the newspaper? Enter it by hand and solve it right here, with all the same hints and highlighting.
Track your progress
Best and average solve times for each difficulty, puzzles finished, and hints used. Watch yourself improve, game after game.
Simple, honest pricing
Free
$0
Always free, forever.
- A fresh Easy puzzle every day
- Every past Easy puzzle in the archive
- Smart hints & the Learn section
- Automatic candidate tracking
- Solve puzzles from the newspaper
Tetsudoku Unlimited
Pay once
No subscription. Ever.
- Everything in Free
- Daily Medium, Hard & Expert puzzles
- The full archive at every difficulty
- Generate custom puzzles at any difficulty, any time
Fresh puzzles are on the way
Tetsudoku is coming soon to the App Store.