Cool Spot Cheats for SNES
Press L and R and keep them held as you power on the SNES. Then while on the Virgin Interactive logo and while you still hold the buttons, press Select 30 times and you should then be free to pick the level of you liking.
If you complete the game on hard difficulty, you should be able to see the better ending.
While on the title screen, press L(2) and R to view the credits.
To mess with the Virgin Interactive logo, press any button and watch the fun soar.