Four Seconds - A timer and a simple rule: stop it at exactly four seconds.
NumberDrop - A uniquely challenging math puzzle game.
Wikids - An encyclopedia that talks to your kids
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
DragonBox Numbers - Teach kids about numbers with an easy and fun game
Sum Fun - A fun number puzzle game for iPhone and iPad.