penpa-edit
An online editor and solver for Sudoku and a huge range of variant puzzles — a staple in puzzle circles.
How to play
Draw clues and constraints onto the grid, then let the built-in solver confirm your puzzle has a unique solution. Export the finished puzzle as an image or a shareable link.
Mouse.
Integration notes
Leans tool rather than pure game, but it opens the door to a 'create and solve' corner that keeps hardcore puzzle fans on your site considerably longer.
FAQ
Is penpa-edit free to play?
Yes. penpa-edit is completely free, runs in your browser, and needs no install or account.
Is penpa-edit open source?
Yes. It hosts the original open-source code by swaroopg92, released under MIT. Source: https://github.com/swaroopg92/penpa-edit
How do you play penpa-edit?
Mouse.
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