Mars Colony TD is a tower defense game. The humans have finally established a settlement on Mars. But the red planet wasn't safe for them. Not long after finishing building the colony the aliens come and started to attack people. Place defense towers in their way to the base and stop the aliens invasion. Build the towers wisely so nobody can pass your defense.
Build defense towers to stop the aliens. Destroy all enemy units before they pass the red flag. If they pass your defense you will loose lives. Click on a tower to see it's stats, upgrade or sell the selected tower.
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