It is a puzzle game which finds the pieces (cards or a Japanese hiragana) which disappeared.
Time until it finds all the pieces that disappeared is recorded.
A piece moves by a double-tap or swipe.
There are six steps of difficulty by the way and motion with which a piece is located in a line.
There are six of 2,3,4,5,6,7 by the number of pieces the iPhone App.
There are nine types of 2,3,4,5,6,7,8,9,10 by the number of pieces the iPad App.