- Developer: Crystal Cao
- Website: Official website
- Release Date: 2017-03-29
- Supports: Game Center,Family Sharing
- Languages: English
- Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Summary
## Description
Do you think subtraction or addition is easier?
You will use subtraction and computational thinking to reduce the numbers to zero.
Easy is not it? But do not be subjective because it will be difficult if you subtract a few wrong steps. It's harder when the numbers will grow and your speed must be increased.
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