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Kotaku
Someone's found a clever way to play muliplayer PSP games with just one copy of a game. I haven't had a chance to test it out, but it sounds completely workable. All you have to do is hot swap the games between to systems and then start playing. Here are all of the gritty details:
Place the game into the 1st PSP. Start the game. Start a Multiplayer Ad-Hoc game. (Set the time to unlimited because moving the game between the units takes a while.) Enter the game. Once you are in the game, remove the game from the unit. A message will appear asking whether you want to exit the game, say NO! The game should resume. Now take the game and place it into the 2nd PSP. Start the game. Now go to Ad-Hoc games and find the server that the other PSP has already started. Enter the game. And now you are playing each other on two PSPs with only one copy of the game.
Apparently, you can do this with three or four machines for UMD-less, mega-multiplay.
PSP Multiplayer With One Game [Dynatech]
