About

Our goal

This site brings together classic sudoku and its lesser-known variants in one place, with no sign-up and no ad fatigue. Each sudoku type has its own page, so you can find exactly what you're after.

What we offer

• Classic sudoku: 9x9, mini 4x4/6x6, big 12x12, and giant 16x16
• Region-rule sudoku: diagonal (X-Sudoku), Windoku, jigsaw, argyle, asterisk
• Number-clue sudoku: killer, sandwich, frame, little killer, quadruple, skyscraper
• Marked-cell sudoku: odd/even, consecutive, Kropki
• Giant sudoku: samurai (5 boards) and twin (2 boards)
• Handy features like notes, hints, fullscreen, and automatic progress saving

How are the puzzles generated?

Every puzzle is generated instantly by an algorithm running right in your browser, and verified to have a single solution. We never send puzzles to a server or fetch them from one.

Feedback

If you run into a bug, have a suggestion, or want to request a new sudoku variant, reach out through our contact page.