Help With Playing Quake 2

I have Quake 4 on xbox 360 and on the back of the Quake 4 game it says that it comes with Quake 2. It even has directions to Quake 2 on the inside but its nowhere to be found. Ive even beaten the game to see if that helped but it didnt. So i just wanted to know if it came with another disk that had it but it didnt come with mine or where it is on the Quake 4 disk.