Inbounds
The inbounds category requires any props, the players camera, placed portals, and travelling portals to not leave the bounds of the map. If any of these conditions are broken, you must reload a save to before the condition was broken. This category relies heavily on save/load abuse and ahop.
Objective
Beat the game by any means necessary without making the players camera, any prop, placed portal, or travelling portals leave the bounds of the map.
Exceptions
Shooting a portal through OOB space that doesn't land anywhere, or accidentally doing clipping glitch in maps like 10, are considered acceptable.