Description Destroy aliens before they complete a tunnel system that connects the top and bottom of the screen together. Destroy or shove blue tunnels or shove pink tunnels to rearrange them and prevent the aliens from completing their mission. Earn additional bombs by destroying blue sections of tunnel. End the round by destroying a preset number of aliens. Your man begins each life in the center of the screen.
Aliens start at the bottom of the screen in the pink sections.
As they move through, they can build new sections in any direction. If they exit the tunnels, they produce Expelers and quickly make their way to the bottom of the screen to re-enter the tunnels. This is the only time that they are vulnerable. Expelers - These enemies, produced by the Blockers, chase your agent around the screen and attempt to corner him. They travel at different speeds, generally moving faster as they get closer to your man.