I know that there are plenty of games out there in android market and on apple's app store that allow for the user to play against others with the same app, which is, to my understanding, from the same marketplace and using the same operating system. My question is whether anyone has heard of any game (preferably puzzle games) that work across platforms. Droid users playing against iphone users...stuff like that. With all the apps out there it doesnt seem like itd be that hard to do...