🍃 A fresh take on Sudoku

Play Window Sudoku Online

Classic Sudoku with four extra windows. Fresh daily puzzles, every day.

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Current Streak0 days

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Best Streak0 days

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Choose a Window Sudoku Difficulty

Play today's surprise level or choose your own challenge.

Daily Puzzle

One shared level chosen fresh each day.

Easy

Learn how the four windows change the grid.

Medium

A balanced everyday Windoku challenge.

Hard

Fewer clues and tighter deductions.

Expert

A serious test for experienced solvers.

How Window Sudoku works

Window Sudoku, also called Windoku or Hyper Sudoku, follows every classic Sudoku rule. In addition, each of the four shaded 3×3 windows must contain the digits 1 through 9 exactly once.

The shaded areas create new relationships across the board, giving familiar Sudoku logic a fresh rhythm. Your progress, notes, streak and daily result are saved on this device.