> I NEED A SEQUEL TO MARBLE MADNESS.
You want Hamsterball. It's fantastic.
http://www.raptisoft.com/Hamsterball/Marble Blast Gold is another excellent marble-rolling game, and I highly recommend it, but it is very different to Marble Madness.
http://www.garagegames.com/pg/product/view.php?id=15Give Neverball a look as well. It plays differently again to the other two (it's more like those old wooden puzzles where you tilt the board to get the ball bearing through the maze), and it's freeware.
http://icculus.org/neverball/