Thanks for the advice once again. Unfortunately collision is still iffy. I take it that UDK is just reacting to my poor topography or something? Here's some footage of what's going wrong. http://tinypic.com/player.php?v=2hok8km%3E&s=8#.VJpsBf8gA It seems that Sonic bounces around whenever he walks over an edge in the mesh, which is a problem since the meshes are triangulated in UDK, so even flat surfaces cause him to hop up like he went off of a ramp. Any ideas to solving that issue? Perhaps just doing a better collision method? Not sure what you mean about the materials. I did a full load of the package and didn't get anything. Is that what you meant for me to try?