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Citadel Zero

Game overview

Citadel Zero

PYRHAMID Studio · Jul 17, 2026

Defend the last citadel on a dying alien world. Summon a gacha collection of bio-engineered defense towers, forge a custom loadout, and conquer three modes, story-driven Chronicle, roguelite Contracts, and 1v1 PvP Ascension. Tower defense meets deck-building meta-progression.

Indie Strategy Free To Play
Last tracked players
0
All-time peak
2
24-hour change
Unavailable

Delayed observation · last tracked . Values marked unavailable are not estimated.

About this game Read the full description

DEFEND THE LAST CITADEL

The last human citadel stands alone on a dying alien world, watched from the ruins by mutated sentinels. You command its defense. Summon an arsenal of bio-engineered towers, forge a custom loadout, and hold the line across three distinct game modes.

Media gallery 7 screenshots · 0 videos
Citadel Zero game capsule image

Screenshots

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System requirements Windows · macOS · Linux

Windows

Minimum

Minimum:
  • OS: Windows 10 64-bit
  • Processor: Intel Core i3 / AMD Ryzen 3 (2018+)
  • Memory: 4096 MB RAM
  • Graphics: DirectX 11 compatible GPU with WebGL 2.0
  • DirectX: Version 11
  • Network: Broadband Internet connection
  • Storage: 500 MB available space
  • Sound Card: Windows Compatible
  • Additional Notes: The Steam client must be running.

Recommended

Recommended:
  • OS: Windows 10 64-bit
  • Processor: Intel Core i5 / AMD Ryzen 5
  • Memory: 8192 MB RAM
  • Graphics: Dedicated GPU (NVIDIA GTX 1050+ or AMD equivalent)
  • DirectX: Version 11
  • Network: Broadband Internet connection
  • Storage: 1024 MB available space
  • Sound Card: Windows Compatible

macOS

Minimum

Minimum:
  • OS: macOS 10.15 Catalina or later
  • Processor: Apple Silicon (M1) or Intel Core i3 — both supported
  • Memory: 4096 MB RAM
  • Graphics: Metal-capable GPU (WebGL 2.0)
  • Storage: 1024 MB available space
  • Sound Card: macOS Compatible
  • Additional Notes: The Steam client must be running.

Recommended

Recommended:
  • OS: macOS 12 Monterey or later
  • Processor: Apple M1 or newer / Intel Core i5
  • Memory: 8192 MB RAM
  • Graphics: Apple Silicon GPU or dedicated GPU
  • Storage: 1024 MB available space
  • Sound Card: macOS Compatible

Linux

Minimum

Minimum:
  • OS: Ubuntu 22.04+ / SteamOS 3 (64-bit)
  • Processor: Intel Core i3 / AMD Ryzen 3 (2018+)
  • Memory: 4096 MB RAM
  • Graphics: Vulkan or OpenGL 3.3 compatible GPU
  • Storage: 1024 MB available space
  • Sound Card: PulseAudio or PipeWire
  • Additional Notes: The Steam client must be running.

Recommended

Recommended:
  • OS: Ubuntu 22.04+ / SteamOS 3 (64-bit)
  • Processor: Intel Core i5 / AMD Ryzen 5
  • Memory: 8192 MB RAM
  • Graphics: Dedicated GPU (NVIDIA GTX 1050+ or AMD equivalent)
  • Storage: 1024 MB available space
  • Sound Card: PulseAudio or PipeWire
Game details Languages, features & support
Publisher
PYRHAMID
Brazilian rating
18
Steam Germany rating
16
Achievements
50
Features
Single-player, Multi-player, PvP, Online PvP, Steam Achievements, In-App Purchases, Steam Cloud, Steam Leaderboards, Family Sharing
Languages
English, French, German, Spanish - Spain, Simplified Chinese, Russian, Portuguese - Brazil
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Developer Analytics

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Frequently Asked Questions

Is Citadel Zero free to play?
Yes, Citadel Zero is free to play on Steam.
What genre is Citadel Zero?
Citadel Zero is a Indie, Strategy, Free To Play game.
Who developed Citadel Zero?
Citadel Zero was developed by PYRHAMID Studio and published by PYRHAMID.
What platforms does Citadel Zero support?
Available on Steam for Windows, macOS, Linux.