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Cepheus Protocol is an Open World RTS Military Survival Game. Play as the CERC hunting Patient 0, maintain Quarantine camps, fight dangerous mutations & Rogue Civilian Combatants . There’s nobody else coming, it’s up to you now.
✓ Supported
✓ 2–4 Players (Co-op)
Unsupported
Keyboard & Mouse
Crowdsourced campaign length, extra objectives, and 100% completion metrics
Session-Based / Party Multiplayer
Designed for dynamic rounds, party matchmaking, and infinite multiplayer replayability. No fixed linear campaign duration.
Official high-resolution media gallery (41 screenshots)




Available game editions, collector bundles, Supporter Packs, and downloadable expansions
Official downloadable expansion or add-on content for Cepheus Protocol (Steam App ID #2496520).
Official downloadable expansion or add-on content for Cepheus Protocol (Steam App ID #2496510).
Official downloadable expansion or add-on content for Cepheus Protocol (Steam App ID #2496500).
Official downloadable expansion or add-on content for Cepheus Protocol (Steam App ID #1387390).
Official downloadable expansion or add-on content for Cepheus Protocol (Steam App ID #2540710).
Official downloadable expansion or add-on content for Cepheus Protocol (Steam App ID #1997150).
Live pricing across official digital stores, historical lows, and subscription catalog availability
Honest player critiques with verified playtime and karma upvoting
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Troubleshooting guides, build recommendations and accepted solutions
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Key directors, leads, and game development studios