Free sudoku in your browser — one shared puzzle a day, plus unlimited easy, medium and hard boards. Every board is generated with a proven single solution.
Difficulty here is the number of clues left on the board after the generator finishes digging: easy keeps 40–50 givens, medium 30–39, and hard 23–29. Fewer givens means longer chains of deduction before the next digit falls out — but never a guess. Every board is checked by a solver that stops as soon as it finds a second solution, so a puzzle is only published once it has been proved to have exactly one.
The daily board is generated from the date itself, so every visitor on a given UTC day solves the identical puzzle — your time is directly comparable to anyone else's, and the share block carries your time and difficulty without spoiling a single digit.
More daily puzzles on the games shelf — try the daily tech word search or guess today's trending repo in Repodle. When you're done, browse 2,000+ Claude Code skills or the free tools workbench.