You have recently taken a position as a security guard in Nightmare Land, tasked with guarding a building. Your mission? To verify the identity of every subject who wishes to enter the building before allowing them in. But be careful: not everyone is who they say they are!

In the game, your task will be to allow or deny entry to the subjects who ask to enter the building. It seems simple, but be careful, you can't miss a single detail, because you can become food for doppelgangers