You need to throw some items (basically junk) to the top of the screen before they fill the game area.
As said, you need to get junk from the sides of the screen and try to get rid of it. This is done launching the stuff items to the top of the screen with the purpose of creating proper combinations that will make them to dissappear.
You can take profit of some special items, but others will make your task more difficult, so think carefully where to put them and solve your Diogenes syndrome.
Game design, GFX & Code: MsxKun (sorry, it wasn't my best day).
Music: Terrific Tunes