Rarely. I mainly write little tests to find memory leaks. Like loading a level every frame or something. It’s useful to me in situations like that but for gameplay stuff it’s just easier to play the game. Having said that though I did make a system that records input and random seeds. The game records these every time you play and if you drag and drop one on to the game it’ll automatically play it. It’s handy for debugging stuff like if Kyle finds a bug I can just grab his replay and see what happened and run it through the debugger on my end.