# 3Doku vs Puzzle IO

The clearest difference is price: Puzzle IO at Free against 3Doku's $2.99. Puzzle IO also leads on update cadence (every 3 weeks vs every 10 months) and ratings volume (348 vs 1). 3Doku's advantage is in-app purchases (none vs 1) and ads (none vs shown). On review sentiment and iOS requirement there is nothing between them.

Puzzle IO is free to download; 3Doku costs $2.99 up front. Puzzle IO sells 1 one-off in-app purchase. 3Doku asks for nothing beyond the download.

3Doku holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Puzzle IO has 348 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 67% of 3Doku's written reviews are positive against 74% of Puzzle IO's, so the app with the better star average is not the one people write more warmly about.

3Doku ships an update every 10 months, Puzzle IO every 3 weeks. The most recent releases landed on September 20, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 3Doku | Puzzle IO |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/3doku/id451510747/reviews)** | [4.6 (348 ratings)](https://appshunter.io/ios/app/puzzle-io-binary-sudoku/id1145765167/reviews) |
| Number of ratings | 1 | **348** |
| Positive reviews | 66.7% of reviews | **74.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 107 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Simone Tellini](https://appshunter.io/developer/372931565) | [99 Up Games](https://appshunter.io/developer/567396068) |

## What reviewers say

### 3Doku

[App page](https://appshunter.io/ios/app/3doku/id451510747)

Experience Sudoku in a new dimension with this challenging puzzle game. Solve complex 9x9x9 cube puzzles where 27 Sudoku schemas intersect. Customize your gameplay with multiple difficulty levels and initial value distributions for endless fun.

**Highlights:** 3-dimensional Sudoku puzzles, 9x9x9 cube gameplay, 27 intersecting Sudoku schemas, 4 difficulty levels, Customizable initial value distributions, Endless challenging gameplay

**In-app purchases:** none


### Puzzle IO

[App page](https://appshunter.io/ios/app/puzzle-io-binary-sudoku/id1145765167)

Experience a modern, fast-paced logic puzzle game based on binary Sudoku. Fill grids with 0s and 1s following specific rules, earn bonuses with a smart point system, and compete globally. Offers endless challenges across six difficulty levels.

**Highlights:** Fill 10x10 grids with 0s and 1s, Equal 0s and 1s per row/column, No three identical numbers in a row, Smart point system with bonuses, Time-based multipliers for higher scores, Game Center support and global leaderboards, Six difficulty levels, Unlimited unique puzzles

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |

**What reviewers like**

- 👍 Simple mechanics
- 👍 Easy to play one-handed
- 👍 Different difficulty modes
- 👍 Guess function if you're not sure of your options
- 👍 Fun and requires the right level of brain power while not being too difficult

**What reviewers complain about**

- 🐛 Hint function is not very useful
- 🐛 'Watch video' for hints doesn't work on the paid ad-free version
- 🔋 High battery consumption
- 💸 Too many ads and long ad breaks
- 🐛 Incorrect error detection on completed rows/columns

**Reported bugs**

- Incorrect error detection on completed rows/columns
- Frequent crashes and bugs
- Game sometimes freezes or becomes unresponsive
- Ads not loading properly, preventing gameplay

**Requested features**

- Dark mode option
- Better hint system that explains the logic
- Option to turn off row/column completion notifications
- More challenging puzzle levels
- Ability to create and save custom puzzles


## Frequently asked questions

### Is 3Doku free?

3Doku costs $2.99, with no in-app purchases.

### Is Puzzle IO free?

Puzzle IO is free to download, with in-app purchases available.

### Which has better reviews, 3Doku or Puzzle IO?

3Doku is rated higher. 3Doku averages 5.0 out of 5 from 1 ratings, while Puzzle IO averages 4.6 from 348 ratings.

### Do 3Doku or Puzzle IO have ads?

Puzzle IO shows ads; 3Doku does not.

### Which is updated more often, 3Doku or Puzzle IO?

3Doku ships an update every 10 months, and Puzzle IO every 3 weeks. Most recently, 3Doku was updated on September 20, 2026 and Puzzle IO on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*