價格：免費
檔案大小：26.1 MB
版本需求：需要 iOS 10.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Will the next card be higher or lower? Swipe left for lower or right for higher and find out!
NEW! Time trials. Play as many games as you can in the specified time. Try to beat your high score!
NEW! Streaks. Keep your streak going by playing every day.
支援平台：iPhone, iPad