Colony Siege combines the best of RTS and tower defense, including base building, mazing, and unit physics. Defend Earth's remaining colonies using an arsenal of deadly weapons to torch, slice, throw, and impale swarms of alien invaders.
We are not affiliated with IsThereAnyDeal.
Colony Siege combines the best of RTS and tower defense, including base building, mazing, and unit physics. Use shockwaves and spring traps to propel enemies into cliffs, lava, and other hazards. Build mechs, tanks, and other mobile units. Decimate massed enemies with air, missile, and orbital strikes. Expansive, non-linear campaign supports single player and 2 player online co-op.
Whether fighting the Xenos or the Riven, no colony building is safe from attack. While protecting the colony Citadel is your primary objective, the enemy will not discriminate when it comes to attacking your colony. Defend against the relentless biomechanical xeno swarm as well as the corrupted Riven that were once human. Both enemy factions behave differently and require different tactics.
Defend with powerful towers that automatically form walls when placed near each other. Use unique traps to slow, impale, burn, or bombard the enemy. Build and command mobile ground units. Strike the enemy with satellite-powered attacks, long-range missiles, commander abilities, and fighter sorties.
Defensive towers and barriers automatically generate a laser fence when constructed close together, allowing your mobile units passage while restricting enemy movement.
Experience dozens of intense missions from a starmap with branching paths. Press your advantage or repeat previous missions for extra cash.
The entire campaign is cooperative from the very first mission to the last. Consolidate forces with a friend or combine different tactics.
Earn money from completing mission primary and bonus objectives, and spend it on persistent upgrades, new weapons, and different towers, traps, units, and strikes. Unlock powerful perks to buffer your weaknesses or bolster your advantages.
Expect a constant change of scenery as you travel to different planets, moons, space stations, and enormous mobile space platforms.
Steam data © 2025 Valve Corporation. Steam and the Steam logo are trademarks and/or registered trademarks of Valve Corporation in the U.S. and/or other countries. Independent of Valve. Pricing and availability subject to change.
Colony Siege combines the best of RTS and tower defense, including base building, mazing, and unit physics. Use shockwaves and spring traps to propel enemies into cliffs, lava, and other hazards. Build mechs, tanks, and other mobile units. Decimate massed enemies with air, missile, and orbital strikes. Expansive, non-linear campaign supports single player and 2 player online co-op.
Whether fighting the Xenos or the Riven, no colony building is safe from attack. While protecting the colony Citadel is your primary objective, the enemy will not discriminate when it comes to attacking your colony. Defend against the relentless biomechanical xeno swarm as well as the corrupted Riven that were once human. Both enemy factions behave differently and require different tactics.
Defend with powerful towers that automatically form walls when placed near each other. Use unique traps to slow, impale, burn, or bombard the enemy. Build and command mobile ground units. Strike the enemy with satellite-powered attacks, long-range missiles, commander abilities, and fighter sorties.
Defensive towers and barriers automatically generate a laser fence when constructed close together, allowing your mobile units passage while restricting enemy movement.
Experience dozens of intense missions from a starmap with branching paths. Press your advantage or repeat previous missions for extra cash.
The entire campaign is cooperative from the very first mission to the last. Consolidate forces with a friend or combine different tactics.
Earn money from completing mission primary and bonus objectives, and spend it on persistent upgrades, new weapons, and different towers, traps, units, and strikes. Unlock powerful perks to buffer your weaknesses or bolster your advantages.
Expect a constant change of scenery as you travel to different planets, moons, space stations, and enormous mobile space platforms.
Colony Siege combines the best of RTS and tower defense, including base building, mazing, and unit physics. Defend Earth's remaining colonies using an arsenal of deadly weapons to torch, slice, throw, and impale swarms of alien invaders.
We are not affiliated with IsThereAnyDeal.
Steam data © 2025 Valve Corporation. Steam and the Steam logo are trademarks and/or registered trademarks of Valve Corporation in the U.S. and/or other countries. Independent of Valve. Pricing and availability subject to change.
