I'll have to be the boring one and go for GTA: San Andreas. I love this game. It has everything. Great graphics, great story, the plot is awesome and the audio is amazing. I bought this game in November of last year and I'm still playing it.
If not SA, I'd have to say Enter The Matrix for PS2. This game has a lot to offer, eg awesome moves, great audio, fantastic graphics and the plot, again, is brilliant.
Definitley two games to go out and buy.
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