價格：免費
檔案大小：557.1 KB
版本需求：需要 iOS 7.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Insanely simple and addictive.
A small ball bounces up and down while slowly accelerating every time you hit. Your goal is to make the ball cross the middle line as many times as possible by tapping above and below the line.
The challenge is to "Stay Inside" and never let the ball leave.
支援平台：iPhone, iPad