Woodoku

Woodoku is a type of Sudoku game where you need to move wooden blocks.  Here you have to think while playing leisurely and calmly. The game features nice graphics and good voice acting, no time limit. The game can be easily installed on your phone without overloading it. By moving tiles leisurely, and thus filling space with planks, you remove them from the board and earn points. It is an excellent meditative but not primitive game to kill the time. There's an offline option to play.