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Cube bounce, just add portals.

Place cube in glassed area at the end of the room, simple.... not allways. If cube goes off course just fizz it using one of the four conviently located buttons. Addendum: This very simple test was one of my earliest attemps at using the ingame editor and has been sitting on my HD for along time due to never working quite right, I think the bugs are finally ironed out but if you can't just get the cube on the button try fizzing it before moving your portals as every cube flight is a little bit diferent.