NumberDrop - A uniquely challenging math puzzle game.
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
Yasminoku - Sudoku game and solver totally written in DHTML.
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.