>disable clipping and/or cinematics
>discover normally inaccessible things beyond the end of a level
What are some games in which you can do this?
If you do it in pic related, you can often find a room or two from the start of the next level at the end of the current one.
Best game ever
>>3845795
Quake
put noclip on and you can find random boxes just outside the world in the greyspace. these contain the monsters that are warped into the main world.
Duke Nukem 3D has some hidden messages by the level designer.