A 1-4 person co-op horror exploration game is called Escape the Backrooms. To try and escape, navigate through creepy backroom levels while dodging monsters and other peril. The community is continually rewarded with free content upgrades that provide new levels and game modes.
Guides
Escape the Backrooms – How to Beat Level the End
Here is short guide with few tips that might help you. Tips to Beat Level the End