We've found a silly little secret on Nintendo's Preview Disc that adds just a bit more gameplay ...
Just when you think it's safe to put that Preview Disc away, those wacky guys at Sega manage to give you another reason to dust it off. (That is, if you've bothered putting it away instead of playing Viewtiful Joe!)
There is an extra playable "level" hidden in the Billy Hatcher demo, accessible if you hold down A as the game is loaded. The "level" is layed out very similar to the normal one, but there are a few new objectives, and new enemies to watch out for.
To make sure you can get into it, launch the Billy Hatcher demo by hitting A at the "PRESS A TO PLAY" screen. As the game is loading, press and HOLD the A Button again, and keep holding it until you've pressed "Start" to begin the Billy Hatcher Demo. Don't let go of A until you're able to play. It won't look much different at first, but once you get down the ramp, you'll see some key differences right away.
Enjoy!