There is no way to shrink a game without down sampling all the audio, video, and textures in the game. This woud defeat the purpose of playing the game. The only way you will be able to fit the game on a DVD is use Dual Layer/Double Layer DVD to record your game back on. There is no way to shrink it. DVD you can shrink because they remove all the extra audio and unneccessary extra and bonus' in the disk with minimal video down sampling.