Given that the PlayStation 2 pretty much has the best gaming library of any console released, this obviously makes for a super hard decision. But if I could only ever play one game from the PS2 era, I would have to choose Metal Gear Solid 3, particularly the Subsistence version. I'm a huge fan of the series and I personally feel that MGS3 was not only Hideo Kojima's crowning achievement, but that it was also the pinnacle of gaming at the time. From the amazing cutscenes, to the melding of stealth and survival gameplay elements, to the graphics which managed to push the limits of the PS2, it's just an overall amazing game.