Each player takes turns pressing any number of buttons in order, and the player who successfully forces the opponent to press the last button is the winner. Great for pressure release, relax, and child education. Accept any phone case color custom and LOGO custom. Small quantity custom please confirm before order. Suitable Phone Size Options: 5.4 inch, 6.1 inch, 6.7 inch. 5 5/16" L x 2 11/16" W x 3/4" H