---
title: "Kaizen Sudoku – Free Sudoku Game With No Ads"
description: "A calm, ad-free Sudoku game for iPhone, iPad and Android. 5+ difficulty levels, daily challenges, smart hints and 20+ hand-crafted themes."
lang: en
url: https://kaizensudoku.com/en/
dateModified: 2026-10-07
alternates:
  en: https://kaizensudoku.com/en/index.md
  tr: https://kaizensudoku.com/tr/index.md
  de: https://kaizensudoku.com/de/index.md
  fr: https://kaizensudoku.com/fr/index.md
  es: https://kaizensudoku.com/es/index.md
  pt: https://kaizensudoku.com/pt/index.md
  it: https://kaizensudoku.com/it/index.md
  ja: https://kaizensudoku.com/ja/index.md
  zh: https://kaizensudoku.com/zh/index.md
  ko: https://kaizensudoku.com/ko/index.md
  ru: https://kaizensudoku.com/ru/index.md
---

# Sudoku, the calm way.

Kaizen Sudoku is a free Sudoku game with no ads: a clean board, more than five difficulty levels from Beginner to Legend, a new daily challenge every day and hints that point you to the next logical move. Play offline, at your own pace.

Free to play, no ads. Optional one-time purchases, never a subscription.

- App Store: https://apps.apple.com/app/id6793465247
- Google Play: https://play.google.com/store/apps/details?id=com.ates.sudoku&referrer=utm_source%3Dkaizensudoku.com%26utm_medium%3Dweb%26utm_campaign%3Dweb-en-home

- Free to play
- No ads
- 5+ difficulty levels
- Daily challenge
- Works offline
- 11 languages

## A board that stays out of your way

Kaizen Sudoku keeps the screen quiet: a large 9×9 board, a number pad and four tools (undo, erase, notes and hint). There are no banners, no pop-ups and no timers you can't hide.

Pencil notes clear themselves when you place a number, undo has no limit, and you decide whether mistakes are highlighted and how many are allowed before the game ends.

## Levels graded by logic

Every puzzle has exactly one solution and is graded by the hardest technique needed to solve it, not by how many numbers are given. Beginner puzzles need only singles; Legend puzzles call for X-Wing, Swordfish and XY-Wing.

- Beginner and Easy: naked and hidden singles.
- Medium: pointing pairs and box-line reductions.
- Hard: pairs and triples.
- Expert and Legend: X-Wing, Swordfish and XY-Wing.

## Free, ad-free and fair

The whole game is free: every puzzle, every difficulty level, the daily challenge and all statistics. There are no ads and no subscriptions.

You get 3 free hints in every game and earn points as you solve, which you can spend on extra hints or a second chance at the mistake limit. If you want more, there are optional one-time purchases: All Themes, Lifetime Premium with unlimited hints and continues, and credit packs.

## Built for daily practice

- A new daily challenge every day, with streaks and monthly trophies.
- Detailed statistics: best times, win rate and recent solve times for every level.
- Several games in progress at once; pick up where you left off, even offline.
- Game Center and Google Play Games leaderboards and achievements.