It is your job to save the planet from its decay. Only you can prevent an extraterrestrial species from taking over all of humankind.
How? By shooting them back to where they belong - into the depths of hell of course!
GUIDES
FAQ
Stuck and need some help? Check out some of the questions the community have asked relating to this game. If none of these answer your problem or you want to get some tips when it comes to a particular level, feel free to submit a question of your own.