If you like puzzle games than Even Up, from Simple Machine, will be right up your street. Inspired by Sudoku, the object of the game is to pair up the numbers and ultimately end up with only one piece on the board. Match the numbers by moving pieces up, down, left and right, each time your join a pair their value increases by 1. With over 125 levels of varying size and difficulty there’s certainly enough to keep the old grey matter busy! There’s also a kids version too.