Physics collision on pixel level.

New problem for me that's probably been tackled before but I couldn't find it.

How do I stop these 1x1 physics objects from overlapping with the immovable solid (red object)?

Hmm, that's a tricky one. I'm not sure how a 1x1 pixel collision box would center. Would it be possible to increase all objects by 4x so that the collision boxes can be a little bigger? (or maybe, create a slightly bigger collision box outside of the graphic area by 1px all around the center).

I'm a dumdum. All I had to do was set that ground objects height to a multiple of 2 (2, 4, 8, 16 and so on) and it worked.

Glad to hear!