價格：免費
檔案大小：56.8 MB
版本需求：需要 iOS 8.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Count how many ducks are in the house by the time the clock stops! Careful! Each round ramps up the difficulty! Great for kids learning math and counting, also for adults ready to test out their quackin cognitive skills.
支援平台：iPhone, iPad