In Fairy Tail chapter 269 during the Grand Magic Games arc, there is an event called Hidden.
The participants are transported to different locations inside a giant city.
They have to find an attack each other using either a physical or magical attack.
The participant who successfully lands an attack earns a point, which gets deducted from the attacked participant.
Now comes the tricky part: The city gets filled with clones of the participants, and they will now have to hide between the clones and try to find the original ones. Because if a participant attacks a clone, he or she loses a point.
I find this very similar to multiplayer games such as Assassin's Creed where you have a target hiding between NPCs and you have to guess which one it is based on its behavior (e.g. if he acts in a strange suspicious way).
So is there some origin to this game concept?