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Cepheus Protocol

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App ID 979640
App Type Game
Developer
Publisher Halcyon Winds
Franchise Cepheus Protocol
Supported Systems Windows
Technologies Unreal Engine, EpicOnlineServices SDK
Last Changenumber 31555314
Last Record Update 8 October 2025 – 17:58:25 UTC ()
Release Date 15 May 2020 – 07:47:00 UTC ()
😏 75.27%
3k reviews
33
In-Game
+12
🧱 Sandbox 🧟 Zombies 🌐 RTS 🌲 Survival ☢️ Post-apocalyptic

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.

Additional Information

Developer Halcyon Winds
controller_support partial
community_visible_stats Yes
workshop_visible Yes
DLCAvailableOnStore Yes
ReleaseState released
Publisher Halcyon Winds
eulas
0 ↴
id979640_eula_0
nameCepheus Protocol EULA
urlhttps://store.steampowered.com//eula/979640_eula_0
version6
Store Release Date 15 May 2020 – 07:47:36 UTC ()
osarch 64
community_hub_visible Yes
AbsoluteMouseCoordinates Yes
Social Media https://discord.gg/hYzMx3JgDN
https://www.facebook.com/CepheusProtocol/
https://www.twitch.tv/halcyonwinds
https://x.com/CepheusProtocol
https://www.youtube.com/channel/UC0eBJIGecAjqbAcJk3IajoQ/
Primary Genre Strategy (2)
Store Genres Action (1), Adventure (25), Indie (23), Simulation (28), Strategy (2), Early Access (70)
Steam Release Date 15 May 2020 – 07:47:00 UTC ()
Store Asset Modification Time 28 June 2025 – 17:04:15 UTC () (1751130255)
library_assets
library_capsuleen
library_heroen
library_logoen
logo_position ↴
pinned_positionBottomLeft
width_pct100
height_pct37.887382340973815
osextended empty string
review_score 6
review_percentage 77
RemotePlayTogetherTestingBranches default
Detected Technologies (?) Unreal Engine, EpicOnlineServices SDK, Intel_OID SDK, Intel_oneTBB SDK, NVIDIA_Nsight_Aftermath SDK, Ogg SDK, Vorbis SDK, XAudio2 SDK
Steam Deck Compatibility
  • Steam Deck:
  • Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
  • This game sometimes shows mouse, keyboard, or non-Steam-Deck controller icons
  • Entering some text requires manually invoking the on-screen keyboard
  • Some in-game text is small and may be difficult to read
  • This game requires manual configuration of graphics settings to perform well on Steam Deck
  •  
  • SteamOS:
  • This game runs successfully on SteamOS
  • Note: Entering some text requires manually invoking the on-screen keyboard
  • Note: Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
  •  
  • category: Playable
  • steamos_compatibility: Compatible
  • test_timestamp: 25 May 2023 – 00:00:00 UTC
  • tested_build_id: 11270075
  • configuration:
    supported_inputgamepad
    requires_manual_keyboard_invoke1
    requires_non_controller_launcher_nav0
    primary_player_is_controller_slot_00
    non_deck_display_glyphs1
    small_text1
    requires_internet_for_setup0
    requires_internet_for_singleplayer0
    recommended_runtimeproton-8.0-2
    requires_h2640
    requires_voice_files0
    gamescope_frame_limiter_not_supported0
    hdr_support0
Content Descriptors Frequent Violence or Gore (2), General Mature Content (5)
controllertagwizard Yes
Early Access Release Date 15 May 2020 – 00:00:00 UTC ()
First seen on SteamDB 8 November 2018 – 08:23:52 UTC (), in changelist #5354722
Content Descriptors (Including DLC) Frequent Violence or Gore (2), General Mature Content (5)

Supported Languages

9 Languages Interface Full Audio Subtitles
English Yes Yes
Simplified Chinese Yes
Korean Yes
German Yes
Japanese Yes
Russian Yes
Spanish - Spain Yes
Portuguese - Portugal Yes
French Yes

Tags

🧱 Sandbox 🧟 Zombies 🌐 RTS 🌲 Survival ☢️ Post-apocalyptic 🏠 Building 💡 Strategy 😖 Gore 🌍 Open World 👤 Singleplayer 🤝 Diplomacy 🌱 Indie 💥 Action 🐤 Early Access 🤔 Tactical 🖥️ Simulation 🏠 Base Building 🪖 Military ▶️ Real Time Tactics 🎒 Survival Horror

Categories

Single-player Online Co-op Steam Achievements Steam Trading Cards Steam Workshop Steam Cloud Remote Play Together Family Sharing Early Access Cloud Gaming Cloud Gaming (NVIDIA) Multi-player Co-op

Hardware Categories

Partial Controller Support

Accessibility Categories

Adjustable Text Size Camera Comfort Custom Volume Controls Stereo Sound Surround Sound Playable without Timed Input Adjustable Difficulty Save Anytime

Assets

Load all asset images
clienticon 37c2f3cbfd4b44cfa88c7815fb4902ebb5d569e2
clienttga 28cbff32772d43a0232e23db730c6c2785b484bc
icon 9b2731c597997e70f9e4bcfcba17829218cf3fa7
logo 442574f6127ef08518c4c25f0c1ad131b9d821f2
logo_small 442574f6127ef08518c4c25f0c1ad131b9d821f2_thumb
small_capsule
englishcapsule_231x87.jpg
header_image
englishheader.jpg
library_assets_full
library_capsule ↴
image/englishlibrary_600x900.jpg
library_hero ↴
image/englishlibrary_hero.jpg
library_logo ↴
logo_position/pinned_positionBottomLeft
logo_position/width_pct100
logo_position/height_pct37.887382340973815
image/englishlogo.png
Assets
main_capsulecapsule_616x353.jpg
small_capsulecapsule_231x87.jpg
headerheader.jpg
page_backgroundpage_bg_generated_v6b.jpg
hero_capsulehero_capsule.jpg
library_capsulelibrary_600x900.jpg
library_herolibrary_hero.jpg
community_icon9b2731c597997e70f9e4bcfcba17829218cf3fa7.jpg
page_background_pathapp/979640
raw_page_backgroundpage_bg_raw.jpg
timestamp28 June 2025 – 17:05:06 UTC
Trailers
347595 ↴
trailer_nameCepheus Protocol Exodus Trailer
trailer_category1
trailer_480p/video/webm256822296/movie480_vp9.webm
trailer_480p/video/mp4256822296/movie480.mp4
trailer_max/video/webm256822296/movie_max_vp9.webm
trailer_max/video/mp4256822296/movie_max.mp4
microtrailer/video/webm979640/347595/c1803967073994f1cd72de53852478743b52bc40/1751171611/microtrailer.webm
microtrailer/video/mp4979640/347595/c1803967073994f1cd72de53852478743b52bc40/1751171611/microtrailer.mp4
adaptive_trailers/0/cdn_path979640/347595/c1803967073994f1cd72de53852478743b52bc40/1751171611/dash_av1.mpd
adaptive_trailers/0/encodingdash_av1
adaptive_trailers/1/cdn_path979640/347595/c1803967073994f1cd72de53852478743b52bc40/1751171611/dash_h264.mpd
adaptive_trailers/1/encodingdash_h264
adaptive_trailers/2/cdn_path979640/347595/c1803967073994f1cd72de53852478743b52bc40/1751171611/hls_264_master.m3u8
adaptive_trailers/2/encodinghls_h264
screenshot_medium256822296/movie.293x165.jpg
screenshot_full256822296/movie_full.jpg
all_agestrue
is_highlighttrue
timestamp1718390752
518246 ↴
trailer_nameCepheus Protocol Uprising Trailer
trailer_category1
trailer_480p/video/webm256918749/movie480_vp9.webm
trailer_480p/video/mp4256918749/movie480.mp4
trailer_max/video/webm256918749/movie_max_vp9.webm
trailer_max/video/mp4256918749/movie_max.mp4
microtrailer/video/webm979640/518246/3ca0674260b2a2cee0ae49284f6173c3dd7b8597/1751171612/microtrailer.webm
microtrailer/video/mp4979640/518246/3ca0674260b2a2cee0ae49284f6173c3dd7b8597/1751171612/microtrailer.mp4
adaptive_trailers/0/cdn_path979640/518246/3ca0674260b2a2cee0ae49284f6173c3dd7b8597/1751171612/dash_av1.mpd
adaptive_trailers/0/encodingdash_av1
adaptive_trailers/1/cdn_path979640/518246/3ca0674260b2a2cee0ae49284f6173c3dd7b8597/1751171612/dash_h264.mpd
adaptive_trailers/1/encodingdash_h264
adaptive_trailers/2/cdn_path979640/518246/3ca0674260b2a2cee0ae49284f6173c3dd7b8597/1751171612/hls_264_master.m3u8
adaptive_trailers/2/encodinghls_h264
screenshot_medium256918749/movie.293x165.jpg
screenshot_full256918749/movie_full.jpg
all_agestrue
timestamp1718390757

Depots

ID Configuration Size DL.
228989 Windows Shared InstallDepot from 228980VC 2022 Redist No size
228990 Windows Shared InstallDepot from 228980DirectX Jun 2010 Redist No size
229007 Windows Shared InstallDepot from 228980.NET 4.8 Redist No size
979641 Windows 64-bitCepheus Protocol Content 8.26 GiB 7.31 GiB
1387390 DLC 1387390Cepheus Protocol Novel (1387390) Depot 1.04 MiB 891.38 KiB
1997150 DLC 1997150Cepheus Protocol Digital Art Book (1997150) Depot 11.34 MiB 10.59 MiB
2496520 DLC 2496520Cepheus Protocol - Support Pack Vehicle Camo NATO Collection 123.69 KiB 105.02 KiB
2514440 Windows 64-bitDLC 2514440Cepheus Protocol - Free Vehicle Camo Post Modern Collection 10.62 KiB 3.20 KiB
2496510 Windows 64-bitDLC 2496510Cepheus Protocol - Support Pack Vehicle Camo Modern Collection 756.39 KiB 752.23 KiB
2496500 Windows 64-bitDLC 2496500Cepheus Protocol - Support Pack Vehicle Camo Classic Wars Coillection 1.11 MiB 1.11 MiB
2540710 DLC 2540710Cepheus Protocol - The Last Line Novella 489.17 KiB 427.77 KiB

Total size on disk is 8.27 GiB and total download size is 7.33 GiB.

Total size on disk is 8.26 GiB and total download size is 7.31 GiB, when filtered to Windows, English, no DLC depots.

Branches

Name Description Build ID Time Updated
public 19849045 4 September 2025 – 02:04:59 UTC
public-playtest Test branch for the rebuild (Coop support). Featured in CERC HQ weekly updates. 20256476 5 October 2025 – 00:50:58 UTC
legacy-premerge Build from before experimental was merged into the live branch. 15464740 31 August 2025 – 20:55:56 UTC

Other

Name Value
baselanguages English, German, French, Korean, Spanish - Spain, Simplified Chinese, Russian, Japanese, Portuguese - Brazil, Spanish - Latin America
workshopdepot Cepheus Protocol (979640)
hasdepotsindlc 0
privatebranches 1
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