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HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
NumberDrop - A uniquely challenging math puzzle game.
Yasminoku - Sudoku game and solver totally written in DHTML.
Griddition - Griddition is a challenging numbers puzzle where you must fill a grid with numbers, Sudoku-style.
nsudoku - A Sudoku game made with ncurses.
Math Search - See posts, photos and more on Facebook.