A free sudoku game — play it in your browser, no install. NINEFOLD — a 3D Sudoku Odyssey · 81 levels across nine realms · true 3D cube puzzles, Killer sums, speed challenges, daily puzzles · free in browser
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Open the live demo Source on GitHubSudoku leaves the page: 81 levels across nine realms, true 3D cube puzzles you turn and slice, Killer sums, memory and speed challenges, daily puzzles and a technique academy.
Built entirely by Claude Opus 5.5. Free in the browser.
9 realms × 9 levels = 81 levels.
CI (.github/workflows/android.yml) builds a versioned APK automatically on v* tags. Web deploys to GitHub Pages on every push to main (.github/workflows/pages.yml).
Practising puzzles reliably makes you better at those puzzles and closely related tasks.
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