Zendoku - Calm Sudoku

North Star Interactive

About this game

Zendoku — Calm Sudoku

A clean, distraction-free Sudoku made for thinking.

Zendoku focuses on understanding the puzzle — not rushing, grinding, or being punished for mistakes.
Every feature exists to help you see the logic and improve naturally.

No ads.
No lives.
No pressure.

Just you and the grid.

Ways to Play

Quick Play
Infinite puzzles in Easy, Medium, Hard, and Expert.

Levels Mode
50 handcrafted puzzles per difficulty.
Progress unlocks gradually as you improve.

Daily Challenge
One new puzzle each day with history.

Weekly Challenge
A larger 12×12 grid for deep focus.
No hints — only validation.

Designed for Focus

• Clean minimal interface
• Notes mode with long-press input
• Undo history
• Visible-mistake counter
• Calm animations
• Color-coded difficulty
• Fully offline — everything stored on device

Statistics track improvement instead of wins or losses:
games played, average mistakes, average time, best time.

Learn Through Logic

Hints don’t solve the puzzle — they explain it.

• Conflict check
• Box-line interaction
• Naked singles
• Optional cell reveal (with warning)

Advanced techniques are intentionally left to the player.
The goal is learning, not skipping.

Zendoku is a thinking companion — closer to paper Sudoku than a typical mobile game.
Open the app, solve, and leave clearer than you arrived.

What’s new

What’s new:
• Fixed a bug where the hint system gave the wrong hint for 6x6 and 12x12 levels.