About this app

Sudoku Journal is an ad-free app for eight sudoku variants. Eight variants Classic, Jigsaw, Killer, Diagonal, Thermometer, Sandwich, Odd/Even, and Windoku share the same board, keypad, and hints. Only the rules change. Classic and Jigsaw also have quick 6×6 Mini puzzles for short sessions. Ad-free at every tier There are no banners, pop-ups, or videos between puzzles. Ads are not part of any tier. Logical puzzles Each board is generated fresh and checked by a logical solver before it is shown. Every puzzle has a logical solution without guessing, trial and error, or dead ends. Difficulty based on technique Easy, Medium, Hard, and Expert are based on the solving techniques a puzzle needs, not on how many numbers were removed. Easy always has a next move. Expert requires advanced patterns. Guided hints When you are stuck, a hint points to the right cell and explains why. The answer is one more tap away, so you can learn the technique instead of watching the grid fill itself. Daily Challenge The Daily Challenge is free every day, uses a different variant, and does not use a weekly puzzle. Complete it to keep the page in your journal and build your streak. Play offline Every puzzle works without a connection, on planes, subways, and in dead zones. No account is required. Free and Ultimate There is no subscription. Free includes 14 new puzzles a week across all eight variants, plus the Daily Challenge. Buy ticket packs for more puzzles, or get Sudoku Journal Ultimate: a one-time purchase for unlimited puzzles in every variant, including variants added later. Privacy You do not need an account. The app does not track you across apps or sell your data. You can turn off anonymous usage statistics in Settings at any time. Questions or ideas? support@sudokujournal.app