Calc Ninja: Mental Math Games
Quick math practice for adults
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- 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.
The developer, kotaro yamada, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- kotaro yamada
- Size
- 124 MB
- Category
- Puzzle
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
English and 3 more
- English, Japanese, Korean, Traditional Chinese
- Age Rating
9+
- 9+
- Infrequent
Cartoon or Fantasy Violence
Contains
Advertising
- Copyright
- © KotaroYamada