I had this thought about static turn-by-turn game applications that exchange game data in URL parameter strings.
So you'd take your turn, and then share the new URL with the other player.
I guess tic-tac-toe is the obvious starting point. But I was wondering how efficiently you can encode Scrabble-like game data in a URL string.
I have been thinking about this FAR too much. It's a really interesting little problem.