Sum Fun - A fun number puzzle game for iPhone and iPad.
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
Numbily - Free Math Game - Train your brain in a easy free math game! Improve your math skills!
Yasminoku - Sudoku game and solver totally written in DHTML.
NumberDrop - A uniquely challenging math puzzle game.
Math Master - Brain Quizzes - Math Master is a free math quiz game designed for all ages!