Tankball is a variation of paintball in which players drive modified full-size tanks and fire paint-filled ping pong balls, paintball Buckshot, or Nerf Rockets at another tank. Each battle pits two tanks against one another, and each tank can contain three or more teammates. Tankball is a much more expensive game than Paintball, and is therefore far less common.
Currently there is only one place the game is available, Leicestershire in England where paint-filled ping pong balls (with a diameter of 40mm) are used as ammunition, in combat restricted to tanks (actually FV432 Amoured Personnel Carriers). Closed-hatch operation is mandatory as the paintballs have too much kinetic energy to safely impact unprotected persons.
Read more about this topic: Paintball Tank