Crashing your game can be extremely simple with the use of two tools.
First, go into Build Mode and scroll all the way to the bottom of the menu filled with objects and select teleport.
Now use the grid-ground and spam a bunch of portals in a three by three, just like a Tic Tac Toe board. after each part has atleast 3 teleporters, spawn a ragdoll above any teleporter, it will take under 10 miliseconds to instantly crash your game.

no idea why you would want this but enjoy