Note: This page is taken from n.wikia.com.(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.