# Hi Sudoku - classic brain game — Ace of crazy fun puzzle games

> Classic Sudoku puzzle game with multiple difficulty levels and helpful tools. (iPhone/iPad app by Puffin Design Inc..)

- Source: https://appshunter.io/ios/app/hi-sudoku-classic-brain-game/id1498699791 (this page in markdown: same URL + `.md`)
- Developer: [Puffin Design Inc.](https://appshunter.io/developer/1393697095)
- Category: Games, Education, Board, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 12.0 · 132 MB
- Languages: English
- Released: 2020-03-27
- Data updated: 2026-06-07
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/hi-sudoku-classic-brain-game/id1498699791/reviews.md

## What is Hi Sudoku?

Hi Sudoku is one of the most popular puzzle games in the world. Now you can play classic pen and paper games directly on your phone! With our simple and elegant design, Hi Sudoku is the best way to play this timeless classic.
Challenge your problem-solving skills with expert-level games, or take a break with quick games in simple mode. Whether you are a competitive problem solver or someone who just wants to relax, whether it is a beginner or a skilled problem solver, Hi Sudoku can let you play the game in your own way.


A classic Sudoku game for beginners and advanced players. Whether you want to relax or stay energetic – spend time in a pleasant way! Take a short break with Sudoku.com or clear your mind. Take your favorite games with you wherever you go. Playing Hi Sudoku on your phone is as good as using pencil and paper.

Challenge your problem-solving skills with expert-level games, or take a break with quick games in simple mode. Whether you are a competitive problem solver or someone who just wants to relax, whether it is a beginner or a skilled problem solver, Hi Sudoku can let you play the game in your own way.


-Thousands of puzzles in completely free format
-Classic Sudoku design, beautifully reproduced on the phone
-Use pencils to make notes on puzzles
-Highlight duplicates to help you solve the puzzle
-Challenge yourself by limiting yourself to three mistakes
-Use hints to help you solve puzzles-through our carefully customized custom Sudoku game
-Four elaborate difficulty levels: simple, medium, difficult and expert.
-Highlight duplicates to avoid repeating numbers in rows, columns and blocks
-Automatic error checking: enable the automatic check function to easily find errors, or disable it to play more free games
-Optional error limitation: challenge yourself, play a perfect game, or relax yourself and enjoy unlimited errors
-Pencil mode: use pencil mode to take notes on each cell and update automatically when playing games
-Statistics: View the best time and stripes for each difficulty level
-Auto save: your puzzles are saved with you, so you can come back at any time
-Hint: When you are stuck, the hint can guide you to solve the problem

EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Thousands of free puzzles
- Classic Sudoku design
- Pencil mode for notes
- Duplicate highlighting
- Hint system
- Four difficulty levels
- Auto save

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium (3 Months) | $4.99 | per 3 months |
| Premium(Monthly) | $1.99 | per month |
| Premium (6 Months) | $5.99 | per 6 months |
| Premium (1 Year) | $7.99 | per year |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/hi-sudoku-classic-brain-game/id1498699791/reviews.md

### 5/5 — This game is so calm and relaxing

*2023-02-20*

Why does nobody know this? It’s amazing

## Frequently asked questions about Hi Sudoku

### Does Hi Sudoku have ads?

No, Hi Sudoku is ad-free, allowing for an uninterrupted puzzle-solving experience.

### What are the difficulty levels in Hi Sudoku?

Hi Sudoku offers four difficulty levels: simple, medium, difficult, and expert, catering to players of all skill levels.

### Can I take notes while playing Hi Sudoku?

Yes, Hi Sudoku features a pencil mode that allows you to take notes on each cell, which are updated automatically as you play.

### How does the hint system work in Hi Sudoku?

When you get stuck, the hint system in Hi Sudoku can guide you towards solving the puzzle, offering assistance without giving away the entire solution.

### Does Hi Sudoku offer offline play?

The description implies that puzzles are saved and can be played at any time, suggesting offline play is possible for downloaded puzzles.

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

Hi Sudoku offers several subscription plans, including monthly, 3-month, 6-month, and yearly options, with prices ranging from $1.99 to $7.99.

### Is Hi Sudoku suitable for young children?

Hi Sudoku has an age rating of 4+, making it suitable for children and adults alike who enjoy logic puzzles.

### How often is Hi Sudoku updated?

The app was last updated on October 6, 2024, indicating regular maintenance and potential new content releases.

## Version history (last 5 releases)

### 2.5.1 — 2024-10-06

The main goal of this update is to enhance the overall player experience, specifically focusing on optimizing in-game ads. Previously, banner ads could disrupt immersion and affect gameplay, so we decided to completely remove them to create a more pure and distraction-free entertainment environment. With this change, players can fully concentrate on the content and fun of the game without any external interruptions, resulting in a smoother and more immersive experience. We are always committed to providing the highest quality entertainment, and this update is a significant step toward that goal.

### 2.4.5 — 2024-09-20

In this update, the beginner level has undergone key adjustments to offer a more enjoyable and dynamic experience for new players. 
Smoother Learning Curve: The difficulty progression at the beginner level has been carefully adjusted to offer a balanced challenge without overwhelming new players, while still encouraging skill development.

### 2.3.3 — 2024-09-17

In this version, we have made several improvements and added new features to enhance your gameplay experience:

UI Optimization: We have improved the interface to make it more user-friendly and visually appealing. The overall layout is more streamlined, making navigation smoother and interactions more intuitive.
New Sudoku Levels: A set of brand-new Sudoku puzzles has been added, offering more challenges for players of all skill levels. Whether you're a beginner or an advanced player, these new levels will keep you engaged.
These updates aim to provide a more polished experience while continuing to expand the game's content.

### 2.2.8 — 2024-09-11

New Animation Effects: We’ve added dynamic and engaging animation effects to enhance the visual experience. These effects bring more energy to key moments in the game, making interactions smoother and more immersive.

Improved UX Experience: Several enhancements have been made to the user interface for a more intuitive and user-friendly experience. Menus, navigation, and in-game prompts have been streamlined to ensure a more seamless and enjoyable journey through the app.

Minor Bug Fixes: A few bugs that affected performance and stability have been addressed, ensuring smoother gameplay and a more reliable user experience.

### 2.1.12 — 2024-09-09

Enhanced Sudoku Algorithm Integration:
The core Sudoku algorithm has been revamped, improving the puzzle generation process to ensure a more challenging and varied experience. With this update, the algorithm now provides a greater diversity of puzzles, ensuring that each game feels unique and balanced across all difficulty levels.

User Interface Optimization:
We’ve overhauled the user interface for a more intuitive and visually appealing experience. The new design makes it easier to navigate through menus, adjust settings, and play without distractions. This enhancement also improves the visual clarity of the Sudoku grid, making it easier to focus on solving the puzzles.

3D Sudoku Model Upgrades:
The 3D models of the Sudoku grid have been refined, offering smoother interactions and better overall performance. The models now incorporate more detailed textures and animations, making the gameplay experience more immersive. Additionally, rendering optimizations reduce lag and ensure the game runs seamlessly on various devices.

More Sudoku Levels:
A wider range of levels has been added to challenge both beginners and expert players. This update introduces new difficulty settings and layouts, offering countless hours of gameplay. With these additional puzzles, players can enjoy a continually fresh Sudoku-solving experience.

This release is designed to provide a more polished and immersive experience for all Sudoku lovers!

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## More apps by Puffin Design Inc.

- [Green Sudoku](https://appshunter.io/ios/app/green-sudoku/id1506074825)
- [A-Mazing 3D: Physics Maze](https://appshunter.io/ios/app/a-mazing-3d-physics-maze/id1506643019)
- [Match 3 Meadows](https://appshunter.io/ios/app/match-3-meadows/id6499473427)
- [Quick Push: 1000+ Sokobans](https://appshunter.io/ios/app/quick-push-1000-plus-sokobans/id6504254203)
- [Fusion 3D - Merge 2248 Numbers](https://appshunter.io/ios/app/fusion-3d-merge-2248-numbers/id6599861406)

All apps by Puffin Design Inc.: https://appshunter.io/developer/1393697095

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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 2026-06-07.*