I love myself some Glitches! I have a very easy gamebreak. First, make a Sledge Black Hole. Second, multigrab and turn all of them into Hammer Brothers, without removing the yellow multigrab box around them. Then, resetrocket the course, and then place a claw!
Bruh. You can also do this by also making 1 door instead of 2 with the black hole then entering it or smuggling the claw to 3D World Edit: or smuggling a car from 3d road to 2d or a stingby from 3d world to 2d
The black hole glitch is a glitch where you make an entity (Usually a large thwomp) think it is in a container but usually a track when it is not. Then you copy it at least 45 times on top of itself and when you put objects into there they can overlap and it even ruins the undo feature which is what lets a lot of very cool glitches work.