check out this free online sonic the hedgehog flash game...it's really quite good
http://www.play.vg/games/135-Sonic%2...0Hedgehog.html
http://www.play.vg/
the Tennis game at that site ain't bad either...play as Navratilova for the best chances
http://www.play.vg/games/142-Tennis%20Game.html
caution: site loads music