# Sudoku Happy Day — Daily puzzle, notes and hints

> Daily puzzle, notes and hints (iPhone/iPad app by 宇 方.)

- Source: https://appshunter.io/ios/app/sudoku-happy-day/id6824120461 (this page in markdown: same URL + `.md`)
- Developer: [宇 方](https://appshunter.io/developer/1813316739)
- Category: Games, Casual, Puzzle
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English, French (France), Chinese (Simplified, China), European Spanish
- Released: 2026-10-20
- Data updated: 2026-10-22

## What is Sudoku Happy Day?

Happy Sudoku is a clear, easy-to-start Sudoku app.

Classic 9×9
Easy, Medium, Hard, and Expert. The selected cell, its row and column, and matching numbers are highlighted. Wrong entries count toward a mistake limit.

Diagonal
Both main diagonals must also contain 1–9 with no repeats.

Daily challenge
One fixed puzzle each day.

Notes and tools
Mark candidates, or mark digits in red to exclude them. Erase, undo, and redo. A few hints each game. Timer with pause.

Learning mode
A 4×4 board for learning the rules before the full grid.

Symbol themes
Switch from numbers to animals, fruit, or colors.

Themes and stats
Several palettes and text sizes. Local stats by difficulty. Resume an unfinished game from the home screen.

Offline. No account. Progress stays on this device. Includes banner ads.

## Is Sudoku Happy Day safe?

Not enough ratings yet to assess Sudoku Happy Day.

## Is Sudoku Happy Day legit?

Sudoku Happy Day has limited verification signals. The AppsHunter Legitimacy Score for Sudoku Happy Day is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-10-21

Diagonal Sudoku, where both diagonals must also be unique. Exclude notes mark digits in red.

### 1.0 — 2026-10-20

No release notes.

## More apps by 宇 方

- [Fish Reading](https://appshunter.io/ios/app/fish-reading/id6752594482)

All apps by 宇 方: https://appshunter.io/developer/1813316739

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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 2026-10-22.*