Metal Gear Acid! is a great game.

If you have a PSP and don't know which game to buy, get MGA. It's a Konami game, so it has to be good. It's a turn based strategy game, and a lot of people say it's like a board game, but it's bound to be good.

The story is good.

Those folks at Konami really know what they are doing.

An interesting change in the Metal Gear Series. I believe you use cards right? It reminds me of Kingdom Hearts for the GBA. Since this game came out around the same time as the PSP was released, it shouldn't cost that much, and is indeed a classic. I don't own a PSP, so I really haven't gotten the chance to play this game much. However, when it did come out, I was considering getting this game along with the PSP.