Sudoku and other number games
Classic logic with new rules, cage-sum deduction, or a deck of number cards. Pick a game and start at your level—no account needed.
The collection
Every game works offline, remembers your progress, and lets you play from white belt through to 1st Dan—with a harder game always waiting.
The timeless original
Rows, columns and 3×3 boxes—the familiar game, presented cleanly with measured difficulty and useful technique-based hints.
View level guideWhite belt through to 1st Dan↓The original, remixed
Mix X, Jigsaw, Hyper, Percent and Colour rules in any combination. Every puzzle is generated for you and proven unique.
View level guideWhite belt through to 1st Dan↓Arithmetic meets logic
No given digits—only dashed cages and their sums. Work from small combinations to satisfying 45-rule breakthroughs.
View level guideWhite belt through to 1st Dan↓Solitaire meets Sudoku
Deal number cards into a real Sudoku grid. Park awkward cards, spend wild jokers and chase suit flushes for bonus points.
View level guideWhite belt through to 1st Dan↓The level system
Every game has the same six-step difficulty ladder. The guide keeps the Kyū rank names so you can see exactly where each belt sits. Move up when you are ready—there is always a harder game.
Built for real play
Rise through the ranksPlay from white belt through to 1st Dan, with a harder game always waiting.
Useful hintsSee the solving technique and reasoning—not just the answer.
Progress savedEvery unfinished puzzle waits exactly where you left it.
