Boss Rush
 | WARNING: This article contains spoilers for the alternative routes of OMORI. |
The Boss Rush is a location in OMORI. It is located inside Humphrey (location) and can only be accessed by feeding him the Giant Check on the last day of the Omori route.
Run by Boss, the facility offers, as the name implies, a "boss rush", a nonstop gauntlet of battles between every major boss in the game, starting with Ye Old Sprout and ending with Humphrey (enemy).
A Mailbox near the service desk sells some of the most powerful healing items in the game.