Just find some stairs and preform a backwards longjump to noclip into level 100000
Hey guys DeSinc here, so basically what you need to do is execute an accelerated backhop towards level 999 and trimp off of this sloped surface to find the entrance to level 9999. then leave the island and visit 9999 a second time, listen to the voice that says jump off and then you'll be teleported to one of the many level 1000 areas which transports you to the frontrooms if you walk forward