What's new · Box Brain Sudoku

November 2026

Version 1.0

Twelve kinds of sudoku in one app: Classic, plus Killer, Jigsaw, Thermo, Arrow, Sandwich, Kropki, Greater Than, Diagonal, Hyper, Anti-Knight and Even-Odd.
Hints that teach: first a nudge towards where to look, then the technique by name and why the move works.
Lessons and practice puzzles for eighteen techniques, from naked singles to swordfish.
Two daily puzzles, a weekly Expert challenge and monthly goals.
Game analysis after a solve shows where the time went and the easier moves you missed. The first three are free.
Hardcore: no hints, no mistake marks and no digit counts. Fill the whole grid, then check it, with its own leaderboard.
Twenty skins, and layouts made for iPhone, iPad and iPhone Duo.
Full VoiceOver support, one-tap setups for low vision and colour blindness, and free braille sheets.
No account: progress syncs through your own iCloud.

Play a daily puzzle in each of the twelve modes in your browser, then share your time as a picture.
Try it yourself on every technique page: three real positions to find the move in.
The whole site in eight languages, with a language menu at the top of every page.
Pick any of the app's twenty skins for the site.
Free printable sheets, and braille for embossers and swell paper.