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Cepheus Protocol

Cepheus Protocol

Early access

ActionAdventureRPGStrategyRTSSimulationOpen-world survival

Platforms
Release:
2020
Developer:
Halcyon Winds
Scale:
Average concurrent players58
Player rating:
75.4% · 3.8K
Profile data as of:
October 19, 2026

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.

Official website

Screenshots

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Videos

Videos from the game’s source page, in source order. Select one to open the original.

Overview

Franchise
Unknown
Release date
  • Windows — May 15, 2020
Developer
Publisher
Age rating
  • ClassInd 14 — Ages 14+ · Steam Store
Content warnings
Frequent violence or goreMature content
Interaction modes
Single-playerMultiplayerOnline co-op
Session capacity
Unknown
Access model
  • One-time purchase
Monetization
Unknown
Storefront price
  • $19.99Steam, US storefront
Store contents
  • 5 Achievements, 7 DLC · Steam Store, November 1, 2026
Languages
EnglishRussianGermanFrenchSpanishPortugueseJapaneseKoreanChinese, Simplified script

Classification

Genres
ActionAdventureRPGStrategyRTSSimulationOpen-world survival
Evidence:
Setting and subject matter
Post-apocalyptic, Zombies
Camera
Unknown
Visual style
Unknown
Combat system type
Unknown

Scale

Concurrent players · period average

58

October 1, 2026 — October 31, 2026

under 100over 1 million
Detailed value
57.95
Coverage
Steam
Origin
Published by source
Confidence
Medium — The site's calculation method is not published
Basis
Average concurrent Steam players over 30 days from Steam Charts: 57
Date observed
October 31, 2026
Source
Steam Charts

Concurrent players · period peak

133

October 1, 2026 — October 31, 2026

under 100over 1 million
Coverage
Steam
Origin
Published by source
Confidence
Medium — The site's calculation method is not published
Basis
Peak concurrent Steam players over 30 days from Steam Charts: 133
Date observed
October 31, 2026
Source
Steam Charts
Ratings
  • players75.4% · 3.8KSteam, US storefront · Steam reviews
Last update

Concurrent players

period average · May 2020 — September 2026 · Steam · published by source · Steam Charts

1210
May 2020September 2026
Change over period
×4.6increase from 9.5 (May 2020) to 44 (September 2026)
Gaps
No gaps in observed months
Observations
77

Mechanics

Key game systems from the Mechanics Catalog. Assessment axes are independent and are not combined into a single score. An unassessed mechanic is unknown, not absent.

  • Clan system

    Not assessed

    A persistent player organization created or recognized by the game itself, with a stable membership, a life beyond one session, a shared identity, functions, and goals.

  • Player economy

    Not assessed

    An in-game system where player decisions materially influence at least part of the production, supply, distribution, or price of in-game value.

  • Territory control

    Not assessed

    A system where players or organizations capture, hold, and use parts of the game world with lasting consequences.

  • Competitive PvP

    Not assessed

    Structured competition between players with rules and a measurable outcome, usually including skill-based matchmaking.

  • Live service and updates

    Not assessed

    A regular rhythm of meaningful updates, including seasons, patches, events, and a roadmap that supports a long product life.

  • Character progression

    Not assessed

    A system for long-term character or account development through levels, skills, equipment, and specializations.

RealmScanner is a research catalog for multiplayer games. Data comes from public sources; coverage and evidence appear beside each assessment.