This is a great game for summer camp!
Step 1: Choose Your Leader
When you have your leader, he or she invites as many people as possible to play the "game". Not everyone will want to play, so don't push it. The idea is that one person is left at the end of the game, who can then be delared the winner.
When the participants have been identified the leader makes a small card bearing each participant's name. These are then distributed to all the players, making sure that no-one gets his or her own name! Only the leader knows the names of those taking part! It is important to maintain as much secrecy as you can. Also each participants does not tell anyone - even their dearest friends that they are in the game. Then the fun begins.
During the next few days as everyone goes about his or her camp activities it is every participant's task to "assassinate" the person who name is on the card they have been given. Assassination is quite painless, it just means tapping the person on the shoulder very quietly and telling them they are "out"! When the person is "out", he or she gives his or her name card (the name of the person they were going to eliminate) to the person who has "assassinated them. That person then goes on to try to eliminate the next person, and so on and so forth....... until one person remains.