Your snow fort is being charged at by menacing winter enemies. Your primary weapon is your stationary gun. With the stationary gun, some enemies take on hit to kill (worth $10), and some take two hits (worth $20). With money, you can buy upgrades. Upgrades help you stay alive, and kill your enemies. The two additional weapons are: nukes and hot water mines. Each kill all the enemies within a zone in one hit. You will also get money when you kill enemies with a mine or nuke. Use the mouse to aim and left click to shoot. When a nuke is equipped, you can use it with space bar.