@NumbOfAthma - problem of physics engines is in how they work. If you have two bricks - one on top of other, then gravity sinks upper brick into bottom one. Physics engin then solves this penetration and repels birck from each other to restore position befeore they started to penetrate. But it can happen, that another new penetrations may appear (with floor, other bricks on side, ...) For this physics engines usually have several iterations for solving positions per frame.  Problem is, that wi