Windoku. Hyper Sudoku.

Hyper Sudoku with four bold window regions. Beautiful new typography, striking dark blue windows, and smart hints — the most elegant Windoku experience.

Windoku is Hyper Sudoku — classic 9x9 Sudoku elevated by four shaded window regions that transform how you solve every puzzle.

The four coloured windows are placed symmetrically inside the grid, each a 3x3 region that must also contain digits 1-9 without repetition. That gives you 13 constraint regions instead of the standard 9 — and it changes everything.

FOUR SHADED WINDOWS • 4 extra 3x3 regions placed symmetrically inside the grid • 13 total constraint regions — 9 standard plus 4 windows • Windows overlap rows, columns, and boxes for powerful logic • Also known as Hyper Sudoku, Window Sudoku, and NRC Sudoku

SIX DIFFICULTY LEVELS • Easy, Medium, Hard, Expert, Pro, Master

DAILY CHALLENGES • A fresh Windoku every day with global leaderboards and streak tracking

TECHNIQUE LIBRARY • Interactive tutorials, smart hints, and campaign mode

ELEGANT DESIGN • Coloured windows, twelve colour themes, dark mode

SMART TOOLS • Pencil marks, unlimited undo, error highlighting, auto-save

PLAY YOUR WAY • Fully offline, no account required, free to play

Download free and discover what four extra windows can do.

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