It's only been alive for just over four years now and already Sony's PlayStation Portable has accumulated a gargantuan library of games, with must-play titles that span every genre from action that matches the quality found in console games (God of War: Chains of Olympus) to games that would seem impossible on the PSP like music games (Rock Band: Unplugged).
Today we start the countdown, but check back tomorrow for the next batch.
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