Tower Defense: Alien Invasion

Alien squads crowd the approach to a lone stronghold. In Tower Defense: Alien Invasion, a 3D strategy game, four modes split the conflict into different fronts. Campaign battles run across 12 maps and move from weaker monsters to heavier alien creatures. Endless defense drops wave after wave on the same line. Online matches place several players on one map against the same invasion. Player-made maps add a custom battlefield that can be saved and shared.

How to play?

Place one of four build options on the field, choosing the spot that hits approaching enemies for the highest damage. Machine-gunner towers fire steady shots along the route. Bomber towers blast groups near their range. Electric lightning strikes invade units with another attack type. Barracks deploy soldiers who join the defense near your structures. Recruit units and fire special attacks when the pressure rises. Building upgrades raise the strength of your defenses during the battle.