http://www.primarygames.com/Number%20Game/start.htm

http://en.wikipedia.org/wiki/Numbers_game

http://www.bbc.co.uk/schools/numbertime/games/index.shtml

http://www.masslottery.com/games/numbersgame.html

http://www.primarygames.com/math.htm

http://www.funbrain.com/numbers.html

http://www.abc.net.au/countusin/games.htm

http://rilot.com/numbers.asp

http://education.jlab.org/nim/index.html

http://www.bbc.co.uk/schools/laac/numbers/chi.shtml