A good time killer game for Android.
A fun way for kids to practice numbers.

Thief Mind is a game that challenges your logic, wit and abilities of deduction. Inspired by the classical analog Mastermind (code breaker) and remaked from the point of view of a thief, you will find number combinations, fighting against time with a limited number of attempts.

iGuess is a mind puzzle which tests your concentration power in 60 seconds.

Classic sudoku game

Do you know Addition of three simple numbers can tease your brain?
Challenge your brain with this simple&unique Number Puzzle Game.