# Killer Sudoku - Brain Puzzle — Daily Math & Number Challenge

> Daily Math & Number Challenge (iPhone/iPad app by Junwei Zhang.)

- Source: https://appshunter.io/ios/app/killer-sudoku-brain-puzzle/id6758942542 (this page in markdown: same URL + `.md`)
- Developer: [Junwei Zhang](https://appshunter.io/developer/1833478808)
- Category: Games, Education, Puzzle, Strategy
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 59 MB
- Languages: English
- Released: 2026-02-11
- Data updated: 2026-05-15
- User reviews in markdown: https://appshunter.io/ios/app/killer-sudoku-brain-puzzle/id6758942542/reviews.md

## What is Killer Sudoku?

Challenge your brain with Killer Sudoku — the advanced twist on classic Sudoku that combines logic, strategy, and math.

Every puzzle is generated fresh. Unlimited puzzles, infinite brain training.

HOW TO PLAY
• Fill the 9×9 grid so each row, column, and box contains 1-9
• Numbers in each cage must add up to the sum shown
• No repeated digits within any cage

FEATURES
• Unlimited puzzles — new puzzle every time
• 4 difficulty levels: Easy, Medium, Hard, Expert
• Smart notes system for pencil marks
• Timer with pause function
• Undo/Redo support
• Error highlighting (optional)
• Same number highlighting
• Track your statistics and best times
• Dark mode support
• No internet required — play offline

Whether you're a Sudoku master looking for a new challenge, or a puzzle lover wanting to train your brain, Killer Sudoku offers endless entertainment.

Free to play. Download now and start solving!

 - Terms of Use (EULA):                                                                                                                                                
  https://www.apple.com/legal/internet-services/itunes/dev/stdeula/                                                                                                     
  - Privacy Policy:                                                                                                                                                     
  https://www.notion.so/elvisccc/Sudoku-Privacy-Policy-3024f78929018097a7f6e4b057021db0

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly Premium | $2.99 | per month |
| Yearly Premium | $14.99 | per year |



## Version history (last 5 releases)

### 1.0.4 — 2026-04-01

Improved experience and stability

### 1.0.3 — 2026-02-27

Daily Challenge is here!
                                                                                                                                                                      
  -  New Daily Challenge mode — a new puzzle every day, same for everyone
  -  Streak system — complete daily challenges consecutively to build your streak                                                                                   
  -  Hints — stuck? Use "Reveal Cell" or "Auto Notes" once per game                                                                                               
  -  Improved stability for restoring purchases

### 1.0.2 — 2026-02-26

- Optimized notes layout to avoid overlapping with cage sums
  - Added Premium subscription to remove ads

### 1.0.1 — 2026-02-16

- Fixed an issue where the app could freeze when starting a new game
  - Significantly improved puzzle generation speed for Hard and Expert difficulties                                                                                   
  - Fixed "Continue Game" option not appearing after returning to home screen                                                                                         
  - Real-time progress indicator now shown during puzzle generation
  - Updated app icon

### 1.0.0 — 2026-02-11

No release notes.

## More apps by Junwei Zhang

- [StrokeScale](https://appshunter.io/ios/app/strokescale/id6757633371)
- [Mines: Minesweeper Bomb Puzzle](https://appshunter.io/ios/app/mines-minesweeper-bomb-puzzle/id6758284167)
- [Word Sort - Connection Puzzle](https://appshunter.io/ios/app/word-sort-connection-puzzle/id6758608958)
- [Binario - Binary Logic Puzzle](https://appshunter.io/ios/app/binario-binary-logic-puzzle/id6759195276)
- [Zip: Number Path Logic Puzzle](https://appshunter.io/ios/app/zip-number-path-logic-puzzle/id6759856549)

All apps by Junwei Zhang: https://appshunter.io/developer/1833478808

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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 2026-05-15.*