Algodoo

I'm scared

Amazing glitch. (I might say that this is a glitch, because the objects can go through the wall)

Yup, the inverted collision glitch. While objects usually tend to collide when entering each others areas, negative density ones "collide" when leaving an area, resulting in them to attach to the borders. Is nice tho

If you use negative density on a gravity object, it usually acts like there is no surface. This is what I use for my "black hole" gravity circles, since it is very hard for anything to collide with it (water can collide, but geometries don't seem to collide most of the time) I do not have to worry about objects collecting on it.

I hope that no one will use this for spammy stuff

Let me introduce you to our brand new GLIDER MARBLE RACE 9001!

features:

booring as all the others.

lulz

Here's another interesting anomaly that I discovered a couple of years ago: Backward Laser