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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
nsudoku - A Sudoku game made with ncurses.
Math Search - See posts, photos and more on Facebook.