03.001 – Invisible wall/floor

OK this is very simple, All you need is dark matter, picture shown below.

All you have to do is make the dark matter as small as you can (make sure you use the square) and drag across for a floor or up or down for a wall!

If you did it right you will be able to stand on the invisible dark matter! (or not be able to walk past it if you did it hight ways)