5月4日 的 Minus 1 Add 1 應用程式分析

Minus by 1 and Add by 1 Compete with other players. Ranking is given in the Game Center. Keep our brain working and productive. Easy math game for kids and family. Given random four digit integer, e.g. 6591. Subtract one from each digit, output four new digits, i.e. 5480. Think and type it as fast as you  展示更多