Blender Game Engine Problem

I am working on making a tank game in BGE but there are a few areas of the ground where i made hills and the tank will go through that part of the mesh as if it were set to no collision

Hello
Bad “Collision bounds” shape/object, maybe?
Better post a .blend, please?
Bye

The best way to avoid this is to triangulate the terrain mesh or use the triangulate modifier.

Quad-based meshes can give some penetration issues otherwise where the faces are bent.