NumberDrop - A uniquely challenging math puzzle game.
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
Sum Fun - A fun number puzzle game for iPhone and iPad.
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
Minimal Sudoku - Minimal Sudoku is an easy to use, clutter-free classic sudoku game which is designed for iOS 7.
Sum - Simple Maths Puzzle - How fast can you add two numbers?