- Three levels of difficulty: Easy, Normal and Hard.
- Three alien races: Greys, Reptilians and Insectoids.
- Evolve your aliens to increase their chances of success.
- Upgrade your spaceships ready for battle.
- Produce weapons of war to give you an advantage over the earthlings.
- Three levels of difficulty: Easy, Normal and Hard.
- Three alien races: Greys, Reptilians and Insectoids.
- Evolve your aliens to increase their chances of success.
- Upgrade your spaceships ready for battle.
- Produce weapons of war to give you an advantage over the earthlings.
