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
Sudoku mastery, day by day
Every Sudoku has a logical path to the end. Tetsudoku teaches you to find it. Four fresh puzzles arrive every morning, one each of Easy, Medium, Hard, and Expert. And when you're stuck, it doesn't hand you the answer. It teaches the next move.
iPhone & iPad · Free to play · 9 languages
Everything you need to solve and improve
Hints that teach
Tetsudoku shows the next logical step, names the cells involved, and explains the strategy behind it. Over time, you need fewer hints.
Learn fifteen strategies
From naked singles to X-Wings and Swordfish, each comes with a full explanation and practice puzzles to master it.
No penciling by hand
Tetsudoku tracks candidates for you. Tap to highlight every cell that can hold a digit, or spot 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 here, with 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.
One purchase unlocks everything
Free
$0
Free forever.
- A fresh Easy puzzle every day
- Every past Easy puzzle in the archive
- Hints that teach & 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
Start solving today
Download Tetsudoku free on the App Store.