All four major screens, plus the "big" scroller screen, music selection screen, aswell as "hidden" remake of the "Reset proof" screen! :-)
Press 1 - 4 to choose the main screens, with SPACE returning you to the menu.
Press B to goto the Big Scroller, and once again SPACE to return.
Press M to select different music.
Whilst in screen one (the 3D screen), press the cursor keys aswell as HOME and END to rotate the object in X, Y, and Z planes. Also pressing Z and X will zoom it in and out!
Finally the "hidden" screen... well, you'll have to find out which key does that! ;-)