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Cepheus Protocol

Developer:
Halcyon Winds
Publisher:
Halcyon Winds
Release:
May 15, 2020
Price:
$19.99

About the game

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.

Platforms:
Windows
Languages:
English, Simplified Chinese, Korean, German and 5 more
AppID:
979640
ActionAdventureIndieMassively MultiplayerRPGSimulationStrategyEarly Access
Steam page (opens in a new tab)Game website (opens in a new tab)

Game metrics

Players (CCU)58+31 (+114.8%) since tracking began
Daily peak from May 1, 2020 to Nov 7, 2026: lowest 18, highest 378, latest 58.
Show data as a table
Players (CCU) chart
DateDaily peakAverage CCU
Nov 7, 20265858
Nov 6, 202650—
Nov 5, 20267054
Nov 4, 20267057
Nov 3, 20267950
Nov 2, 20267858
Nov 1, 202610877
Oct 31, 20269372
Oct 30, 202611473
Oct 29, 20269275
Oct 28, 20269570
Oct 27, 20269873
Oct 26, 202612378
Oct 25, 2026133103
Oct 24, 202612496
Oct 23, 20269879
Oct 22, 20269474
Oct 21, 202611365
Oct 20, 20269753
Oct 19, 20266542
Oct 18, 20268559
Oct 17, 20268355
Oct 16, 20266640
Oct 15, 20265635
Oct 14, 20265137
Oct 13, 20266642
Oct 12, 20267551
Oct 11, 20268262
Oct 10, 20267657
Oct 9, 20266747
Oct 8, 20267454
Oct 7, 202663—
Oct 6, 202660—
Oct 5, 202671—
Oct 4, 2026106—
Oct 3, 202673—
Oct 2, 202661—
Oct 1, 202650—
Sep 30, 202657—
Sep 29, 202653—
Sep 28, 202658—
Sep 27, 202662—
Sep 26, 202654—
Sep 25, 202644—
Sep 24, 202636—
Sep 23, 202637—
Sep 22, 202642—
Sep 21, 202650—
Sep 20, 202668—
Sep 19, 202665—
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Sep 14, 202660—
Sep 13, 202687—
Sep 12, 202668—
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Sep 10, 202648—
Sep 9, 202669—
Sep 8, 202680—
Sep 7, 2026113—
Sep 6, 2026119—
Sep 5, 2026102—
Sep 4, 202681—
Sep 3, 202676—
Sep 2, 202690—
Sep 1, 202692—
Aug 31, 2026108—
Aug 30, 2026135—
Aug 29, 2026142—
Aug 28, 2026122—
Aug 27, 2026103—
Aug 26, 2026106—
Aug 25, 2026109—
Aug 24, 2026113—
Aug 23, 2026148—
Aug 22, 2026134—
Aug 21, 2026102—
Aug 20, 2026108—
Aug 19, 2026107—
Aug 18, 202692—
Aug 17, 202697—
Aug 16, 2026146—
Aug 15, 2026156—
Aug 14, 2026117—
Aug 13, 202691—
Aug 12, 202680—
Aug 11, 2026103—
Aug 10, 2026100—
Aug 9, 2026144—
Aug 1, 2026311—
Jul 1, 2026206—
Jun 1, 2026155—
May 1, 2026116—
Apr 1, 202684—
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Feb 1, 2026162—
Jan 1, 2026190—
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Jun 1, 2023114—
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Feb 1, 202356—
Jan 1, 202380—
Dec 1, 2022106—
Nov 1, 202272—
Oct 1, 202292—
Sep 1, 202251—
Aug 1, 202275—
Jul 1, 202287—
Jun 1, 2022145—
May 1, 2022114—
Apr 1, 202241—
Mar 1, 202275—
Feb 1, 202276—
Jan 1, 202289—
Dec 1, 2021106—
Nov 1, 2021159—
Oct 1, 2021378—
Sep 1, 202195—
Aug 1, 2021120—
Jul 1, 202166—
Jun 1, 202189—
May 1, 2021122—
Apr 1, 2021195—
Mar 1, 202130—
Feb 1, 202154—
Jan 1, 202122—
Dec 1, 202018—
Nov 1, 202034—
Oct 1, 202028—
Sep 1, 202050—
Aug 1, 202075—
Jul 1, 202029—
Jun 1, 202040—
May 1, 202027—
Events

Online before Nov 5, 2026: peaks by SteamCharts

Reviews

New reviews per period, all languages

—3,031 reviews
Positive
+2,398
Negative
−758
Score for the period
76%
2,398 positive and 758 negative reviews in the period.
Show data as a table
New positive and negative reviews
DatePositiveNegative
Jun 2020367
Jul 2020281
Aug 2020476
Sep 2020433
Oct 2020181
Nov 2020261
Dec 2020131
Jan 2021121
Feb 2021174
Mar 2021232
Apr 2021665
May 20217310
Jun 2021547
Jul 20215010
Aug 2021305
Sep 2021353
Oct 202112121
Nov 20217011
Dec 20215710
Jan 20223714
Feb 2022287
Mar 20223013
Apr 2022247
May 20224916
Jun 20223917
Jul 20223211
Aug 20224012
Sep 2022234
Oct 20222613
Nov 20221916
Dec 20223311
Jan 2023287
Feb 2023225
Mar 2023176
Apr 2023197
May 20232110
Jun 2023417
Jul 20237024
Aug 20232712
Sep 2023115
Oct 2023226
Nov 2023257
Dec 20233710
Jan 20244212
Feb 20244413
Mar 20243310
Apr 20243916
May 2024198
Jun 2024206
Jul 2024258
Aug 20244011
Sep 2024217
Oct 2024217
Nov 2024164
Dec 20242712
Jan 20252311
Feb 2025133
Mar 2025112
Apr 2025248
May 2025217
Jun 2025197
Jul 20253420
Aug 20252112
Sep 20251810
Oct 20252019
Nov 20251913
Dec 202558
Jan 20264832
Feb 20263218
Mar 20263516
Apr 20262514
May 20261415
Jun 20262416
Jul 20262816
Aug 20264016
Sep 2026132
Oct 20262018
Nov 202655

Events

Release, patches, sales and announcements from Steam

Events
PictureDateTypeTitle
Patch2026.9.4 Experimental Patch Notes & September Development Update (opens in a new tab)
Patch2026.8.21.1 Experimental Patch Notes & August Development Update (opens in a new tab)
BuildBuild 24829887
News2026.8.13.1 Now Out: Final Push to Escalation (opens in a new tab)
Patch2026.8.4.1 + 4.2 Experimental and Normal Patch Notes (opens in a new tab)
News2026.7.31.3 Quality of Life Update Live + GPU Fog of War Tonight on Experimental (opens in a new tab)
News2026.7.27 CERC OPS Arrives on Experimental Plus Major Fixes (opens in a new tab)
NewsWorld Reveal of CERC Ops This Saturday! (opens in a new tab)

Stats

Sales and revenue are GameLens estimates

Copies sold
90.9K (60.9K – 120.9K)
Gross revenue (base game)
—
Reviews
3K
Review score
—
Followers
—
Average daily concurrent players (30 days)
61.3
Peak concurrent players
58
Copies sold in the last 7 days
-4.1K
Estimate the developer’s net revenue →

Achievements

5 on Steam, rarest first

Difficulty of getting all achievementsMedium

At most 20% of players have every achievement · median 34%

  • Build the Artillery Unit20%

    Hidden achievement

  • Avid Listener28%

    Listen to a custom music track

  • Didn’t go as planned…34%

    Hidden achievement

  • And so it begins....65%

    Survive your first day on the island

  • Into the Deep End81%

    It Begins.... Your first steps on Treasure Island

Builds and manifests

Build 24829887 · updated Aug 20, 04:25 AM UTC · Install size: 11.2 GB · Steam PICS data

Branches

BranchBuild IDUpdatedDescription
public24829887Aug 20, 04:25 AM UTC
experimental26505136Nov 7, 11:53 AM UTCPreview build with new features. Unstable, frequent updates, saves may break.
legacy20415865Jan 7, 03:05 AM UTCThe branch before we merged the rebuilt game as default on 1.6.25
legacy-premerge15464740Aug 31, 08:55 PM UTCBuild from before experimental was merged into the live branch.

Depots and manifests (public)

DepotNameOSLanguageManifestSize
979641windows 64-bit819097904778483719211.2 GB
1387390DLC 138739012865295322998462231 MB
1997150DLC 1997150264631492017067722611 MB
2496500DLC 2496500windows 64-bit71133645434568538731 MB
2496510DLC 2496510windows 64-bit87255752570452467611 MB
2496520DLC 249652030076999811748870820 MB
2514440DLC 2514440windows 64-bit53434260920766360580 MB
2540710DLC 254071073741742575026970850 MB

Similar games

Most shared genres and tags

GameLensSales, revenue and owner counts are GameLens estimates, not official figures. Sources: Steam Web API, Steam Store, IsThereAnyDeal API (price history). Not affiliated with Valve Corporation.