價格：免費
檔案大小：44 MB
版本需求：OS X 10.9.0 或以上版本，64 位元處理器
支援語言：英語
Roll as far as you can and do not touch the lasers!
Use the full length of the tube to move around, collect the rings and dodge obstacles!
And remember: Gravity can not be beaten, but sometimes it can.
