Sokoban, aka warehouse keeper: a 2d puzzle game where you have to figure out how to get blocks across the room to their destination without blocking yourself in.
Maths: plus, minus, times, etc. Has no standard accepted definition according to wikipedia.
Put them together and you have a fun little relaxing puzzle game. You need to push number blocks into their destinations, aided by doing simple arithmetic along the way. Relaxing, simple game that gets challenging as the levels progress. Good luck!