# Calc Ninja: Mental Math Games

> Quick math practice for adults

Canonical page: [https://chrome-stats.com/d/id6784948949](https://chrome-stats.com/d/id6784948949)

## Overview

- **ID:** `id6784948949`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** kotaro yamada
- **Category:** Puzzle
- **Version:** 1.0.2
- **Last updated:** 2026-08-26
- **First published:** 2026-07-01
- **Size:** 118 MB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/calc-ninja-mental-math-games/id6784948949)
- **Website:** [https://main.d21odfgwc83uql.amplifyapp.com/apps](https://main.d21odfgwc83uql.amplifyapp.com/apps)
- **Privacy policy:** [https://main.d21odfgwc83uql.amplifyapp.com/](https://main.d21odfgwc83uql.amplifyapp.com/)

## Description

Fill in the blanks, build the answer, and slash demons! 30 stages from addition to double brackets. Free mental math training.

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.

## Rankings

- #2,266,387 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6784948949)