# Sudoku 81 — 81 squares, 0 ads, ∞ logic

> Ad-free Sudoku puzzles with multiple difficulty levels and unlimited free play. (iPhone/iPad app by Stefan Hoppe.)

- Source: https://appshunter.io/ios/app/sudoku-81/id6753922054 (this page in markdown: same URL + `.md`)
- Developer: [Stefan Hoppe](https://appshunter.io/developer/1657830581)
- Category: Education, Games, Board, Puzzle
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 12 MB
- Languages: American English, German (Germany)
- Released: 2025-11-24
- Data updated: 2026-06-10
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/sudoku-81/id6753922054/reviews.md

## What is Sudoku 81?

A clean take on classic Sudoku.

Play unlimited puzzles in Level 1 for free. Unlock all 6 difficulty levels with an optional upgrade. Always ad-free.



Privacy Policy
https://sudoku81.com

Terms of Use
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Unlimited free puzzles
- Multiple difficulty levels
- Ad-free experience
- Clean interface
- Optional upgrade for full access

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Annual | $9.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $29.99 | one-time |



## Frequently asked questions about Sudoku 81

### What is Sudoku 81?

Sudoku 81 is a classic Sudoku puzzle game with a clean interface. It offers unlimited free play on Level 1 and an optional upgrade to unlock all six difficulty levels.

### Does Sudoku 81 have ads?

No, Sudoku 81 is always ad-free, providing an uninterrupted puzzle-solving experience.

### How much does Sudoku 81 cost?

The app is free to download and play with unlimited puzzles on Level 1. An optional upgrade is available to unlock all difficulty levels, with subscription plans starting at $0.99 weekly or $9.99 annually.

### What are the subscription options for Sudoku 81?

Sudoku 81 offers a weekly subscription for $0.99 and an annual subscription for $9.99, which includes a 3-day free trial.

### What age rating is Sudoku 81?

Sudoku 81 has an age rating of 4+, making it suitable for a wide range of players.

### What devices support Sudoku 81?

Sudoku 81 is available on iPhone and iPad devices.

### How often is Sudoku 81 updated?

The latest version, 2.0, was released on February 3, 2026, indicating active development and updates.

### What learning methodology does Sudoku 81 use?

Sudoku 81 focuses on developing logical reasoning and problem-solving skills through its classic number puzzle gameplay.

## Version history (last 5 releases)

### 2.0 — 2026-02-03

Landscape support for iPad

### 1.9 — 2026-01-20

Landscape support for iPad

### 1.8 — 2026-01-18

Landscape support for iPad

### 1.7 — 2026-01-15

Landscape support for iPad

### 1.6 — 2026-01-14

Landscape support for iPad

## More apps by Stefan Hoppe

- [Classic Sudoku on Canvas](https://appshunter.io/ios/app/classic-sudoku-on-canvas/id1464413166)
- [Artdoku.com: Sudoku Art Puzzle](https://appshunter.io/ios/app/artdokucom-sudoku-art-puzzle/id6503255045)
- [Art of Sudoku · Lightkeeper](https://appshunter.io/ios/app/art-of-sudoku-lightkeeper/id6755204515)
- [Chess on iMessage](https://appshunter.io/ios/app/chess-on-imessage/id6755674616)
- [Sudoku Daily Art: Puzzle Game](https://appshunter.io/ios/app/sudoku-daily-art-puzzle-game/id6760569139)

All apps by Stefan Hoppe: https://appshunter.io/developer/1657830581

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*