價格：免費
檔案大小：1.4 MB
版本需求：需要 iOS 9.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Come and try your eyesight level!
Can you find the one with different colors from the many small squares with the same color? Constantly adjust your level! Test your eyesight and reaction nerves! Challenge your limits!
Tips: Each group will give a set of grids, only one of which has a slightly different color. If you find it, you can score. If you step on the wrong grid, you lose, so - keep your eyes open!
支援平台：iPhone, iPad