Rex Xtra Level:
Begin on "Level 11" and play until you get to the point where the big dinosaur starts after Crash. At this point, get captured by the second pterodactil and you will get to level 32.

Another Xtra Level:
Begin on "Level 14" and play until you see the alien crossing sign(about half way thru the level and on the left side). Just run right into the sign and you will be taken to the bonus level 31. Good Luck!

Demo Game:
To access the "Spyro the Dragon" demo enter the following at the Main Menu:
Up(x2) Down(x2) Left Right Left Right Square