Expert killer sudoku — play free online

100,000 expert puzzles, every one verified to have exactly one solution: sprawling 6-cell cages and long deduction chains. Genuinely mean, never unfair.

Information-poor cages that only yield to multi-region arithmetic. Read the expert guide first — then bring patience.

Puzzle numbers are permanent — #4,821 is the same puzzle for everyone, forever — so you can send a friend a link and race them. Progress saves automatically in your browser, pencil marks tidy themselves, and there's a dark mode for late-night solving.

Not sure this is your level?

Try the daily puzzle — difficulty rotates through the week, easy on Mondays through expert on Sundays, so you can find your ceiling one day at a time.