Crash Bash - Spyro Year of the Dragon Demo
There is a hidden demo of Crash Bash in this game. If you have it, all you have to do is wait for the main menu to appear (after the egg breaks the sign). When it does, hold down L1 + R1 + Square at the same time and you'll be taken to the Crash Bash demo, where you can use the cheat menu. The menu in this demo does not let you play any level from the 5th Warp Room, but the majority of the game is still there. The levels from that Warp Room are still in the disc, but you can only access them with a GameShark.