Note: This page is taken from
Unlocked exit door

Closed and open exit door

(As written in the N in-game help)
Freedom!! At least, freedom to proceed to yet another danger-filled room. The exit must first be activated from a remote terminal before it can be used.
The exit is the portal of liberation... at least for a brief moment, before one enters another level of complete doom and despair. The player needs to enter an exit after unlocking it with an exit switch to finish a level. Once the exit is reached, the ninja will do one of eight victory poses.

Other uses Edit

Exit doors may be used as an obstacle, hindering getting gold that is placed further (see: 4604 exit bridge by THUNDER).