I don’t think you can do this, can anyone officially confirm this? A work around seems to be, create tiles with different physics materials, and use the entire tile for the physics effect you are looking for, eg sand on 1 tile, rock on the next tile. Not close to ideal, so if anybody has a better idea, please let’s hear it. Why would I want it? Rock has more bounce than short grass, which in turn has more bounce than sand, etc.