TDoom

Defense strategy

TDoom is a tower defense game for PC about holding off an alien invasion while evacuation rockets prepare to launch. You command the remaining armed forces as a tactical AI, building defenses around the Ark and trying to keep it intact until liftoff. Each point of damage to the Ark represents civilians who won’t escape.

Before each battle, you place and rotate units. A tank’s facing determines its firing arc, a fighter jet’s heading sets its bombing run, and a helicopter patrols the area where you position it. Once the invasion starts, you watch your plan play out against waves that grow from thousands to hundreds of thousands of aliens.