You need

7 or more people to play this game.

The object of the game is to not get tug first or else you are on in the next game. One person is on and everyone else hides and when the person finds you, you have to run. If you get tug you are on with the person that tug you and eventually everyone will have been tug and the person that was tug first is on. You can carry on playing for ever because the game can keep going on and on and on. So enjoy playing your own game of infection.