I'm making a map in H5 that has objects fly out of a central area, bounce of a pyramid object and land on platforms to topple them. However, despite the energy of the objects, I can't get any object to topple. This seems to be because the objects being launched don't have enough inertia to topple anything. I've used the boulders, but they aren't heavy enough. What small block has a heavy mass? Does such a block exist? EDIT: I ended up using destroyed tanks as my object of choice.