Heavy Weapon (or Heavy Weapon: Atomic Tank) is a horizontally scrolling shooter developed and published by PopCap Games and released in 2005. In Heavy Weapon the player guides a powerful atomic tank through several stages of opposing enemy forces in Cold War. The tank moves only left and right while its main weapon a turret gun can be aimed in a 180 degree span and nukes which can destroy enemies off the screen. The game's storyline deals with a Red Star (a parody of the Soviet Union with touches of the Russian Empire) invasion and the player takes the role of the commander of an Atomic Tank to repel the invasion back into the main headquarters of Red Star.