The games industry employs people whose only job is to play video games. That sounds like relaxed paddling, but it’s a pretty complex and exhausting job.
from
Matthias Kreienbrink
A door can break anything. At least if it isn’t properly animated. The pawn has to pick up the doorknob and close it again behind him. The door changes light and shadow conditions, restricts freedom of view and freedom of movement. In short, a door in a video game is a highly complex matter and many errors can occur. Very few players know that – because in the best case, everything just works.