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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.
NumberDrop - A uniquely challenging math puzzle game.
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
dworksheets.com - Free K-12 math worksheets to assist students, teachers, parents & tutors to practice, teach or prepare grade school assignments, classwork or homework questions & answers is available online in printable & downloadable format.
nsudoku - A Sudoku game made with ncurses.