Admittedly, I don't know much about PSP multiplayer having played little to no multiplayer on the console. So please forgive my lack of knowledge about the topic and its terminology. But are there any games which officially support playing a game with multiple players, locally, with a single copy of the game? I'm thinking like the Nintendo DS's single card download play option, but obviously with one PSP UMD or download instead of everyone being required to have one copy per console. And if there are any games that support this option, what are they, and what are the steps for playing multiplayer this way? Is there some convenient list online of most or all of the games with this capability?