Generally if you are inside of something you shouldn’t be, the game will pop you out on top of it (“upwarp” you). This can be abused in several ways.
The most well known / prevalent upwarp is this one. It was discovered by Cheftoad on 2018-05-18 in Waterfall (original video & Discord saga). Thermospore made a tutorial for it. It can be done anywhere that same geometry shows up, for example in:
(wait, there are some cases where that geometry wont work, right? like if there is no floor above? or like at the end of Pet where there is a tiki torch above)
Originally we thought it only worked on PC, but limbus discovered on 2024-09-30 that it works on PS1 too (video). You just have to do it on the opposite side, due to a change in Quad triangulation
(implement this info/speculation from limbus on the requirements for it to work)
There is a tendency for the camera to get stuck after doing an upwarp (particularly in Waterfall). Fortunately it is avoidable:
Yeah the trick is to start moving immediately
If you let croc upwarp and don’t move, the camera won’t follow you
So just start moving immediately after clipping and it almost never gets stuck