Variant sudoku, done right.
A curated iOS app for killer, thermo, arrow, and other variant sudokus. Daily puzzles, offline solving, clean rules. No ads, no trackers.
What's inside
Built for variants
Not a classic sudoku app with extras bolted on — variant rules are first-class from the ground up.
Generated, never scraped
Every puzzle is generated and tested in-house. No third-party content, no licensing surprises.
Daily puzzle
A fresh puzzle every day, ready when you want a focused solve without hunting through a catalog.
Offline solving
Keep solving started and saved puzzles without a connection, including progress, pencil marks, and undo history.
No ads, no trackers
Free tier supported by an optional Variant+ subscription. Your gameplay isn't telemetry.
Made for focus
Pencil marks, error checks, undo, and a UI that gets out of the way while you solve.
Acknowledgements
Puzzle generation, validation, and difficulty research use CP-SAT techniques and Interactive Sudoku Solver (ISS) by sigh as offline analysis tools. ISS is MIT licensed.
Shout-out to Logic Masters Germany, Sven from SudokuPad, and Cracking the Cryptic for their influence on the variant sudoku community.