# Blue 81: Sudoku block puzzle — Fill lines & square with block

> Block puzzle and Sudoku hybrid game with line and square clearing mechanics. (iPhone/iPad app by Athena FZE.)

- Source: https://appshunter.io/ios/app/blue-81-sudoku-block-puzzle/id1492846180 (this page in markdown: same URL + `.md`)
- Developer: [Athena FZE](https://appshunter.io/developer/1371969144)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free
- Rating: 4.85/5 from 40 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 80 MB
- Languages: English
- Released: 2020-01-03
- Data updated: 2026-06-06
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/blue-81-sudoku-block-puzzle/id1492846180/reviews.md

## What is Blue 81?

BLUE 81: SUDOKU BLOCK PUZZLE is a fabulous combination of classic tile-matching games and sudoku. This addictive and easy-to-learn game is a perfect choice to challenge your logic and intelligence as well as to relax and rejuvenate your brain and body!
Strategically drag the blocks to fit the 9x9 board and fill up lines or 3x3 squares to clear them. Keep the board clean and aim for the highest score as much as possible. The core gameplay is jazzed up with the modern blue blocks and grids as an alternative for the classic woody interface style.
◉ Fabulous combination of block puzzle games & sudoku
◉ Dark mode/ Light mode feature
◉ Clear the lines & squares to score
◉ Beat your high score and challenge other players
◉ Simple, yet challenging - It’s hard to put this game down!
◉ Relaxing & brain training
Carving out time and having a blast playing BLUE 81: SUDOKU BLOCK PUZZLE now for free!

## Key features

- Combination of block puzzle and Sudoku
- Drag blocks to fit 9x9 board
- Clear lines and 3x3 squares
- Modern blue block and grid aesthetic
- Dark and light mode options
- Challenge high scores

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/blue-81-sudoku-block-puzzle/id1492846180/reviews.md

### 5/5 — Meow

*2023-05-09, version 1.0.1*

Love this game

### 5/5 — Blue 81

*2021-03-24*

I like this game very much!

### 5/5 — The best game for me.

*2020-07-26*

Most enjoyable and very difficult game.

### 5/5 — 81

*2020-06-13*

Absolute wonderful game

### 5/5 — Cool game

*2020-02-14*

Easy.

### 5/5 — Free Block

*2020-02-11, version 1.0.1*

This game is excellent love playing.SCKCFA

### 5/5 — 81

*2020-01-28*

Challenging to say the least. Makes one think w/ out all the suspense. A#1 game.

### 5/5 — Love it!!

*2020-01-27*

Sooo addictive!!

## Frequently asked questions about Blue 81

### What is Blue 81: Sudoku Block Puzzle?

Blue 81: Sudoku Block Puzzle is a free mobile game that combines the mechanics of block puzzle games with Sudoku logic. Players strategically place blocks on a 9x9 grid to clear lines and squares.

### How do you play Blue 81: Sudoku Block Puzzle?

You drag and drop blocks onto the 9x9 board. Clearing full horizontal or vertical lines, or 3x3 squares, removes those blocks and earns you points. The goal is to keep the board clear and achieve a high score.

### Is Blue 81: Sudoku Block Puzzle free to play?

Yes, Blue 81: Sudoku Block Puzzle is completely free to download and play, as indicated by its 'Free' price.

### Does Blue 81: Sudoku Block Puzzle have ads?

No, the application data indicates that Blue 81: Sudoku Block Puzzle does not contain advertisements.

### What devices is Blue 81: Sudoku Block Puzzle available on?

Blue 81: Sudoku Block Puzzle is supported on iPhone, iPad, and iPod devices.

### What is the age rating for Blue 81: Sudoku Block Puzzle?

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

### How often is Blue 81: Sudoku Block Puzzle updated?

The latest version was released on January 22, 2020, indicating a less frequent update schedule since its initial release on January 3, 2020.

### What makes Blue 81: Sudoku Block Puzzle unique?

Its unique selling proposition is the fusion of classic block-matching gameplay with Sudoku-style logic, presented with a modern blue aesthetic and offering both light and dark modes.

## Version history (last 2 releases)

### 1.0.1 — 2020-01-22

- Performance and stability improvements.
- Add vibrate responding feature.
- Turn off sound setting now also effecting to interstitial ads.
We glad that you enjoy playing Blue 81. We read all your reviews carefully for making Blue 81 even better for you. Please leave us some feedback to let us know why you love this game and what you’d like us to improve in it. Keep your mind always sharp with Blue 81!

### 1.0.0 — 2020-01-03

No release notes.

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## More apps by Athena FZE

- [Block Puzzle 100](https://appshunter.io/ios/app/block-puzzle-100/id972013240)
- [Block Puzzle Woody Origin](https://appshunter.io/ios/app/block-puzzle-woody-origin/id1078160821)
- [Woody Extreme Block Puzzle](https://appshunter.io/ios/app/woody-extreme-block-puzzle/id1108371959)
- [Game42 Premium](https://appshunter.io/ios/app/game42-premium/id1122349247)
- [Block Puzzle Westerly](https://appshunter.io/ios/app/block-puzzle-westerly/id1164022904)
- [Klondike Solitaire: Card Games](https://appshunter.io/ios/app/klondike-solitaire-card-games/id1166102795)

All apps by Athena FZE: https://appshunter.io/developer/1371969144

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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 2026-06-06.*