The objective of the paper is to design a mathematics learning game, EduTetris:an individual learning game for mental computation. As mental computation skills are used in everyday life, many researchers have indicated that mental computation skills facilitate students’ arithmetic computation. It is important to teach the skills and strategies of mental computation for students when learning mathematics. In this study, we implemented a game on PDA and designed a unique material for learning digits which sum to 10. The game was used to help students practice mathematics addition and mental computation. In addition, an evaluation of the system and results were also conducted.