Last year GamePro wrote about the 10 best PSP games in honor of the system turning two, and it ended up being one of 2007's most popular stories (apparently there are quite a few of you PSP gamers out there). But perhaps the third year's a charm because since last March there's been an influx of awesome PSP games. So now, with three years of titles in the bank, GamePro settled on 21 must-play games that are all worthy to be claimed one of the PSP's best.
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