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kazu

A free sudoku game — play it in your browser, no install. Grid number and logic puzzles for JavaScript and TypeScript: Sudoku and its variants, Futoshiki, Skyscrapers, Kakuro, Slitherlink, Nurikabe and more. Typed engines, checked puzzles, SVG boards and bilingual players. Zero runtime dependencies.

by @johnmorrisdotca · johnmorrisdotca/kazu on GitHubLANG TypeScriptHOSTED ON JOHNMORRISDOTCA.GITHUB.IOUPDATED 15 Oct 2026

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From the README

Grid number and logic puzzles for JavaScript and TypeScript.

Sudoku (4×4 to a 25×25 Colossus), Jigsaw, Diagonal and Killer Sudoku, Futoshiki, Skyscrapers, Shikaku, Hitori, Nurikabe, Akari, Juosan, Loop, Masyu, Yajilin, Ripple Effect, Cross Sums, Regions and Heyawake. Dedicated typed engines, independently checked puzzles, SVG drawing, saved progress, and English and Japanese players for touch, mouse and keyboard. No runtime dependencies.

Kazu is a family of grid puzzles: number placement, regions, shading, lights and loops. Each puzzle has its own rules and engine.

Read the full README on GitHub →

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