Citadel Zero
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About Citadel Zero
Citadel Zero is a tower-defense game set on a dying alien world, where the last human citadel faces mutated sentinels watching from the ruins. You command the citadel’s defense, summon bio-engineered towers and forge a custom loadout to hold the line across three game modes.
Frequently asked questions
Yes. Citadel Zero is free to play on Steam, so there is nothing to buy to start playing.
The minimum requirements for Citadel Zero are: Windows 10, Intel Core i3, 4 GB RAM, 500 MB storage. It also runs on macOS. The recommended specs are in the System requirements section.
Yes. Citadel Zero has multiplayer and a single-player mode. It supports online PvP.
Yes. Citadel Zero is the full base game. You need nothing else to play it.
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