"Front Line is a military combat-themed arcade game released in 1982 by Taito Corporation. The original arcade version consists of a joystick, a single button (other than the "player one" and "player two" start buttons), and a rotary dial that can be pushed in like a button, which fires the weapon. The single button is used to throw grenades, and to enter and exit the tank." Source: Wikipedia, "Front_Line_(arcade_game)," available under the CC-BY-SA License.