# Sudo9 — Train Your Brain Daily

> Train Your Brain Daily (iPhone/iPad app by YUPENG ZHA.)

- Source: https://appshunter.io/ios/app/sudo9/id6759557397 (this page in markdown: same URL + `.md`)
- Developer: [YUPENG ZHA](https://appshunter.io/developer/1879492841)
- Category: Games, Casual, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 3 MB
- Languages: American English
- Released: 2026-03-02
- Data updated: 2026-10-25

## What is Sudo9?

Sudo9 is a beautifully crafted Sudoku puzzle game designed for players of all skill levels.

FOUR DIFFICULTY LEVELS
From beginner-friendly Easy puzzles to mind-bending Expert challenges — difficulty graded by solving technique, not just the number of clues.

• Easy — Solvable with naked singles
• Medium — Requires hidden single techniques
• Hard — Mixed strategies including pointing pairs
• Expert — Advanced techniques for seasoned solvers

DAILY CHALLENGE
A new puzzle every day. Build your streak and keep your brain sharp.

SMART FEATURES
• Teaching hints that explain the logic, not just the answer
• Notes mode for pencil marks
• Undo/redo for fearless experimentation
• Auto-highlighting of matching numbers
• Clean, distraction-free interface

DESIGNED FOR YOU
• Light and dark mode
• 5 color themes (Purple, Green, Orange, Rose, Cyan)
• Progress tracking across all difficulties
• Sound effects and haptic feedback

Remove ads with a one-time purchase. Your game data stays on your device.

Train your brain. One number at a time.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Is Sudo9 safe?

Not enough ratings yet to assess Sudo9.

## Is Sudo9 legit?

Sudo9 has limited verification signals. The AppsHunter Legitimacy Score for Sudo9 is 48 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-03-03

No release notes.

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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 2026-10-25.*