The Atomic Base II is an AI-controlled boss that appears in Survival mode. When it you win a passage will open up at the border that at the other side has the boss inactive. The room is a slightly bigger version of the Sandbox mode's room. It is inactive when first seen but activates when you shoot it. When it is shot it rotates slowly and turns on the barrels. Every 10 seconds it will turn around. The "lasers" will instantly kill you, no matter how much HP you have. Has a 10% chance of spawning, but only if you have beaten the Atomic Base I 2 times. Ends the game when killed.