HALT (High Altitude Lawn Tennis), basically you use a tennis ball and tennis rachet and hit the ball as high as you can, then keep it from hitting the ground. me and my tennis team used to do this at tennis matches while we waited for a court to open. and for halo: Cloak Magnum: everybody has cloak and a magnum (obviously), no shields, no grenades, no vehicles, pistols on map, damage resistance and bonus points enabled.