價格：免費
檔案大小：2.1 MB
版本需求：系統需求：iOS 10.0 或以後版本。相容裝置：iPhone、iPad、iPod touch。
支援語言：英語
Are you confident in your attention and judgment? Drag the ball to control its proportion from 0 to 100. Get as close as possible to the number given by the prompt and try to get how many points you can get.
支援平台：iPhone, iPad