Walk through any wall offline!
In multiplayer, go to any level that has gooey stuff and a hovership. Start off by getting a hovership and go where your practically touching the goo. Get out of your hovership. While your flailing, press triangle to get back in your hovership. You can now walk through any wall! Note: I would recommend switching to first person mode so you can see more inside of the wall in case there is an edge right by you in the wall. You also have to jump to get in the wall.
Added by: UToobDood7 Aug 17th 2007, ID#27566