All of the beta stuff from their discs including Xbox E3, Gamecube prototype and Mario Kart Double Dash disc images. These include object placement layouts, original music, and much more that isn't in the final game. To install, place these into your game's dvdroot folder. Notes: For the Xbox E3 .bin files, you will need to delete one or more team's level bin files to work since that will cause heavy loading and it will crash.