Earthly

Cannot enter Alien Forest or Radiating Rocks tiles.

Native

Sea

Cannot enter Boiling Ocean tiles.

Amphibious

Cannot enter Alien Forest or Radiating Rocks tiles.

Antigravity

Units of this class can be only attacked by Light Saucer and Hunter units.

Burrowing

Cannot enter Thick Mountains tiles. Unist of this class can be only attacked by Earth Sub and Antiburrow Missile units. These units can travel across oceanic terrains only by Burrow Tubes.

Missile