I plan to buy this game (a sequel) but the truth is that I'm more interested in the first game: "The Chronicles of Riddick: Escape from Butcher Bay". I read on wikipedia that the 1st game is included with the 2nd game, my question is, is it included in the disk or is it a code that's included? I plan to buy it second hand, and if it's a code, I'm worried it would have already been used. If it's included in the disk however I'll definitely buy it. It will be on the Xbox 360 if that helps.