This game is most fun when played with a large group. Split the group into two teams, each team having a flag or other marker at the team's base.
The object of the game is to run into the other team's territory, capture their flag and makeit safely back to your own territory. You can tag "enemy" players in your territory, sending them to your jail. They can be sprung from jail by a number of their own team running into your territory, tagging them and running back, with one freed person allowed per jail break. It is sometimes played that all people in jail could hold hands and make a chain back toward their own territory, making it easier for member of their team to tag them.
Number of people: Large Group
Supplies: 2 flags or markers