Prop Hunt from Garry's Mod
https://www.youtube.com/watch?v=urPODJzQHAw
Basically hide and seek, but instead of just hiding in a random spot in some environment, you disguise yourself as any object you choose in a room (or rooms) full of random objects.
The seekers have to find and kill every hider to win, but if they shoot an object that isn't a player, they damage themselves.
Hiders can move around as whichever object they're disguised as, and they can change which object they are at any given time. Basically hiders disguise themselves as whichever object they grab.
obviously you would have to hide their names and health in the event.