# Calc Ninja: Mental Math Games — Quick math practice for adults

> Quick math practice for adults (iPhone/iPad app by kotaro yamada.)

- Source: https://appshunter.io/ios/app/calc-ninja-mental-math-games/id6784948949 (this page in markdown: same URL + `.md`)
- Developer: [kotaro yamada](https://appshunter.io/developer/1193903506)
- Category: Games, Education, Puzzle
- Price: Free
- Age rating: 9+
- Requires: iOS 18.0 · 118 MB
- Languages: American English, Japanese, Korean, Chinese (Traditional, Taiwan)
- Released: 2026-07-01
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/calc-ninja-mental-math-games/id6784948949/reviews.md

## What is Calc Ninja?

Calc Ninja is a mental-math battle puzzle. Fill the blanks in each equation to strike down the oni!

How to play
1. Each battle shows an equation with blank tiles, e.g. ( □ + □ ) × □ = 18.
2. Tap number tiles to fill the blanks so the equation is true.
3. A correct answer strikes the demon; a wrong answer or running out of time lets it strike you.

Content
- 30 scrolls across 6 ninja ranks (Shoden to Gokui)
- 16 unique oni bosses with a demon gallery
- Operators and parentheses stay fixed. You only place the numbers, so it is pure mental math.

Great for
- Adults who want daily brain training
- Anyone who likes number puzzles and quick arithmetic
- Fans of a Japanese ninja-and-oni theme

Free to play. No account required.
* This app is a work of fiction. Characters and story are not based on real people or events.


## Version history (last 3 releases)

### 1.0.2 — 2026-08-26

- Improved ad display stability
- Updated internal components to the latest version
- Minor bug fixes and performance improvements

Thank you for playing! Your reviews keep us motivated.

### 1.0.1 — 2026-07-26

- Added English, Korean, and Traditional Chinese. Enjoy Calc Ninja in your device's language.
- Polished the title screen.
Thanks for playing! We'd love to hear your feedback in a review.

### 1.0.0 — 2026-07-02

No release notes.

## More apps by kotaro yamada

- [おっさん爆発　全１００ステージのパズル頭の体操！脳トレゲーム](https://appshunter.io/ios/app/id1194943923)
- [伸ばして進め！-激アツ！！棒伸ばしタイミングアプリ-](https://appshunter.io/ios/app/id1239162552)
- [渋谷世界一　-ぴったりタワー積み上げゲーム-](https://appshunter.io/ios/app/id1242233822)
- [進めドーナッツ](https://appshunter.io/ios/app/id1247241408)
- [世界一選手権 -反射神経タップ-](https://appshunter.io/ios/app/id1315414071)
- [欅合衆国-パズルとクイズの新感覚ゲーム- for 欅坂46](https://appshunter.io/ios/app/for-46/id1326548301)

All apps by kotaro yamada: https://appshunter.io/developer/1193903506

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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 2026-08-27.*