What Proven Sudoku does

Three boards a day. The same three for everyone. Free in a browser, with no account.

Play today's puzzle

• The daily puzzleThree boards a day, the same three for every player in the world, new at midnight UTC.
• Difficulty you can trustEach level is defined by the hardest technique a board really needs, and every board is checked before anyone sees it.
• Shaped boardsFour boards that are ordinary sudoku plus exactly one extra rule, playable at every level.
• Pencil marks and hintsEverything you need to work a board, and a hint that refuses to solve it for you.
• Your statsYour times are kept for good, unlike the boards, so you can see whether you are actually getting faster.
• Sharing a resultA shared result carries your level and your time, and cannot give the board away.

Going deeper

Four pages go further than these. How difficulty works sets out the grading. Variants covers the added rules. The technique library holds every way to solve a board. How to play covers the controls.