You must have the current version of the adobe flash player to play this online Sudoku puzzle game.
http://mrnussbaum.com/mathgames/
http://www.rpedu.pintoricardo.com/matematica_e_os_jogos.php
http://www.sc.didaxis.pt/nm/jogos.htm
http://www.mathplayground.com/games.html
http://www.sheppardsoftware.com/math.htm
http://www.mathsisfun.com/games/
http://themathgames.com/
http://www.topmarks.co.uk/maths-games/11-14-years/number/
http://www.kidsmathgamesonline.com/
http://www.softschools.com/math/games/
http://www.math-play.com/