short version: You are the good one and have to kill the evil ones. :)

long version: A big meteorite collided with our planet. Almost all humans died because of toxic gas spreading out the meteorite, but some people could rescue themselves under the ground and built up a tunnel system to live in. After two years they discovered evil creatures, which cooperate with other humans in another tunnel. As the only fighter of the humans living in your tunnel system it's on you to kill them. Can you manage it to prevent them from taking over your tunnel system? Will you rescue your friends?

To unlock the next level, you simply have to kill all enemies (the number in the upper right corner of the game screen) and enter the code for the next level, without loosing all your hitpoints displayed at the upper left corner of the game screen.

Your enemies will try to walk into your direction for shooting you. So try to look always around you and kill them before they get to close.

Move the mouse and click to shoot, you do not shoot straight, you shoot exactly at the position you click.