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Default Challenge

This is an open challenge for anyone! Create a challenging but solvable single player test chamber within the default size. Here are the rules:

You may NOT expand the chamber beyond the default size (8 wide, 6 deep, 4 tall). You may, however, pull surfaces inward and create goo pits in the floor. You may NOT create behind-the-scenes mechanisms to trigger elements inside the chamber. All puzzle elements must be contained within the chamber. You may make some connections invisible if you choose. You may NOT use Hammer or an external editor to manipulate the map, only the in-game puzzle maker can be used.

I hope to see some innovative and compact designs! :)