The Game Census
Cepheus Protocol cover art

Cepheus Protocol

Halcyon Winds · 2020-05-15

SteamEpic Games Store

ActionAdventureIndieMassively MultiplayerRPGSimulationStrategyEarly Access

Modes: Single player, Multiplayer, Co-operative

Releases: May 15, 2020 (PC (Microsoft Windows))

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.

81
playing now
75%
positive of 3.7k reviews
Mostly Positive
steam rating
200,000–500,000
owners (SteamSpy est.)
silver
deck/linux tier (ProtonDB)
$15.99
steam price (US)

81 players in-game as of 2026-08-30 03:00 UTC (census sample)

Cepheus Protocol is an open world RTS military survival game. You play as CERC, hunting Patient Zero while keeping quarantine camps alive. Hold the line against brutal mutations and rogue civilian combatants. No reinforcements. No backup. It is on you.(Storyline via IGDB)

Health check

Healthy
  • · 81 players in-game at the last census sample.
  • · 346 reviews in the last 8 weeks (~43/week).
  • · Review velocity up 27% vs the prior 8 weeks.
  • · Top 19% of 10,903 Action games in the census by review count.
Estimated sales: 75k–168k copies

Review-multiple estimate from 3,742 total reviews — how this is computed.

Current store prices

lowest across shops (ITAD)$15.99-20%

Deal snapshots via CheapShark, refreshed daily.

All-time low: $9.89 at Steam (2020-10-29) · bundled 2×via IsThereAnyDeal

12-month high $19.99 · on sale 13 of 24 observed days (census price snapshots)

Review momentum

PositiveNegative
12112120202026Week of 2020-05-01: 21 positiveWeek of 2020-05-01: 1 negativeWeek of 2020-06-01: 36 positiveWeek of 2020-06-01: 7 negativeWeek of 2020-07-01: 28 positiveWeek of 2020-07-01: 1 negativeWeek of 2020-08-01: 47 positiveWeek of 2020-08-01: 6 negativeWeek of 2020-09-01: 43 positiveWeek of 2020-09-01: 3 negativeWeek of 2020-10-01: 18 positiveWeek of 2020-10-01: 1 negativeWeek of 2020-11-01: 26 positiveWeek of 2020-11-01: 1 negativeWeek of 2020-12-01: 13 positiveWeek of 2020-12-01: 1 negativeWeek of 2021-01-01: 12 positiveWeek of 2021-01-01: 1 negativeWeek of 2021-02-01: 17 positiveWeek of 2021-02-01: 4 negativeWeek of 2021-03-01: 23 positiveWeek of 2021-03-01: 2 negativeWeek of 2021-04-01: 66 positiveWeek of 2021-04-01: 5 negativeWeek of 2021-05-01: 73 positiveWeek of 2021-05-01: 10 negativeWeek of 2021-06-01: 54 positiveWeek of 2021-06-01: 7 negativeWeek of 2021-07-01: 50 positiveWeek of 2021-07-01: 10 negativeWeek of 2021-08-01: 30 positiveWeek of 2021-08-01: 5 negativeWeek of 2021-09-01: 35 positiveWeek of 2021-09-01: 3 negativeWeek of 2021-10-01: 121 positiveWeek of 2021-10-01: 21 negativeWeek of 2021-11-01: 70 positiveWeek of 2021-11-01: 11 negativeWeek of 2021-12-01: 57 positiveWeek of 2021-12-01: 10 negativeWeek of 2022-01-01: 37 positiveWeek of 2022-01-01: 14 negativeWeek of 2022-02-01: 28 positiveWeek of 2022-02-01: 7 negativeWeek of 2022-03-01: 30 positiveWeek of 2022-03-01: 13 negativeWeek of 2022-04-01: 24 positiveWeek of 2022-04-01: 7 negativeWeek of 2022-05-01: 49 positiveWeek of 2022-05-01: 16 negativeWeek of 2022-06-01: 39 positiveWeek of 2022-06-01: 17 negativeWeek of 2022-07-01: 32 positiveWeek of 2022-07-01: 11 negativeWeek of 2022-08-01: 40 positiveWeek of 2022-08-01: 12 negativeWeek of 2022-09-01: 23 positiveWeek of 2022-09-01: 4 negativeWeek of 2022-10-01: 26 positiveWeek of 2022-10-01: 13 negativeWeek of 2022-11-01: 19 positiveWeek of 2022-11-01: 16 negativeWeek of 2022-12-01: 33 positiveWeek of 2022-12-01: 11 negativeWeek of 2023-01-01: 28 positiveWeek of 2023-01-01: 7 negativeWeek of 2023-02-01: 22 positiveWeek of 2023-02-01: 5 negativeWeek of 2023-03-01: 17 positiveWeek of 2023-03-01: 6 negativeWeek of 2023-04-01: 19 positiveWeek of 2023-04-01: 7 negativeWeek of 2023-05-01: 21 positiveWeek of 2023-05-01: 10 negativeWeek of 2023-06-01: 41 positiveWeek of 2023-06-01: 7 negativeWeek of 2023-07-01: 70 positiveWeek of 2023-07-01: 24 negativeWeek of 2023-08-01: 27 positiveWeek of 2023-08-01: 12 negativeWeek of 2023-09-01: 11 positiveWeek of 2023-09-01: 5 negativeWeek of 2023-10-01: 22 positiveWeek of 2023-10-01: 6 negativeWeek of 2023-11-01: 25 positiveWeek of 2023-11-01: 7 negativeWeek of 2023-12-01: 37 positiveWeek of 2023-12-01: 10 negativeWeek of 2024-01-01: 42 positiveWeek of 2024-01-01: 12 negativeWeek of 2024-02-01: 44 positiveWeek of 2024-02-01: 13 negativeWeek of 2024-03-01: 33 positiveWeek of 2024-03-01: 10 negativeWeek of 2024-04-01: 39 positiveWeek of 2024-04-01: 16 negativeWeek of 2024-05-01: 19 positiveWeek of 2024-05-01: 8 negativeWeek of 2024-06-01: 20 positiveWeek of 2024-06-01: 6 negativeWeek of 2024-07-01: 25 positiveWeek of 2024-07-01: 8 negativeWeek of 2024-08-01: 40 positiveWeek of 2024-08-01: 11 negativeWeek of 2024-09-01: 21 positiveWeek of 2024-09-01: 7 negativeWeek of 2024-10-01: 21 positiveWeek of 2024-10-01: 7 negativeWeek of 2024-11-01: 16 positiveWeek of 2024-11-01: 4 negativeWeek of 2024-12-01: 27 positiveWeek of 2024-12-01: 12 negativeWeek of 2025-01-01: 23 positiveWeek of 2025-01-01: 11 negativeWeek of 2025-02-01: 13 positiveWeek of 2025-02-01: 3 negativeWeek of 2025-03-01: 11 positiveWeek of 2025-03-01: 2 negativeWeek of 2025-04-01: 24 positiveWeek of 2025-04-01: 8 negativeWeek of 2025-05-01: 21 positiveWeek of 2025-05-01: 7 negativeWeek of 2025-06-01: 19 positiveWeek of 2025-06-01: 7 negativeWeek of 2025-07-01: 34 positiveWeek of 2025-07-01: 20 negativeWeek of 2025-08-01: 21 positiveWeek of 2025-08-01: 12 negativeWeek of 2025-09-01: 18 positiveWeek of 2025-09-01: 10 negativeWeek of 2025-10-01: 20 positiveWeek of 2025-10-01: 19 negativeWeek of 2025-11-01: 19 positiveWeek of 2025-11-01: 13 negativeWeek of 2025-12-01: 5 positiveWeek of 2025-12-01: 8 negativeWeek of 2026-01-01: 48 positiveWeek of 2026-01-01: 32 negativeWeek of 2026-02-01: 32 positiveWeek of 2026-02-01: 18 negativeWeek of 2026-03-01: 35 positiveWeek of 2026-03-01: 16 negativeWeek of 2026-04-01: 25 positiveWeek of 2026-04-01: 14 negativeWeek of 2026-05-01: 14 positiveWeek of 2026-05-01: 15 negativeWeek of 2026-06-01: 24 positiveWeek of 2026-06-01: 16 negativeWeek of 2026-07-01: 28 positiveWeek of 2026-07-01: 16 negativeWeek of 2026-08-01: 31 positiveWeek of 2026-08-01: 12 negative
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

151382026-08-07 00:00 — 109 players2026-08-07 08:00 — 56 players2026-08-07 16:00 — 113 players2026-08-08 00:00 — 94 players2026-08-08 08:00 — 77 players2026-08-08 16:00 — 123 players2026-08-09 00:00 — 115 players2026-08-09 08:00 — 78 players2026-08-09 16:00 — 130 players2026-08-10 00:00 — 83 players2026-08-10 08:00 — 51 players2026-08-10 16:00 — 89 players2026-08-11 00:00 — 80 players2026-08-11 08:00 — 38 players2026-08-11 16:00 — 85 players2026-08-13 00:00 — 77 players2026-08-14 07:00 — 54 players2026-08-15 15:00 — 121 players2026-08-16 23:00 — 85 players2026-08-18 07:00 — 39 players2026-08-19 14:00 — 60 players2026-08-20 22:00 — 86 players2026-08-22 05:00 — 74 players2026-08-23 13:00 — 85 players2026-08-24 20:00 — 105 players2026-08-26 03:00 — 65 players2026-08-27 11:00 — 68 players2026-08-28 19:00 — 118 players2026-08-30 03:00 — 81 players
Concurrent players, hourly average, last 30 days (census samples).

Price history

$19.99$9.892020-05-162026-08-242020-05-16 — best price $18.992020-08-10 — best price $14.992020-11-02 — best price $14.992020-11-28 — best price $14.992021-02-11 — best price $11.992021-06-24 — best price $11.242021-11-01 — best price $19.992022-01-05 — best price $19.992022-05-16 — best price $17.992022-06-25 — best price $16.192022-09-05 — best price $19.992022-11-23 — best price $16.992023-03-06 — best price $16.992023-04-07 — best price $17.992023-05-29 — best price $17.992023-07-13 — best price $19.992023-09-04 — best price $19.992023-11-02 — best price $19.992023-12-11 — best price $19.992024-01-10 — best price $19.992024-03-04 — best price $19.992024-04-10 — best price $15.992024-05-20 — best price $15.992024-07-11 — best price $19.992024-09-23 — best price $19.992024-12-04 — best price $19.992025-01-27 — best price $19.992025-03-20 — best price $19.992025-04-14 — best price $19.992025-07-10 — best price $19.992025-08-18 — best price $19.992025-10-06 — best price $19.992025-12-15 — best price $19.992026-02-03 — best price $15.992026-03-19 — best price $15.992026-06-25 — best price $15.992026-08-24 — best price $15.99
Lowest recorded price across tracked stores, per day (census snapshots).

Twitch viewers

202026-08-26 21:34 — 0 viewers2026-08-26 22:34 — 0 viewers2026-08-26 23:34 — 0 viewers2026-08-27 01:34 — 1 viewers2026-08-27 02:34 — 2 viewers2026-08-27 03:34 — 1 viewers2026-08-27 04:34 — 0 viewers2026-08-27 05:34 — 0 viewers2026-08-27 06:34 — 0 viewers2026-08-27 07:33 — 0 viewers2026-08-27 08:34 — 0 viewers2026-08-27 09:33 — 0 viewers2026-08-27 10:34 — 0 viewers2026-08-27 11:34 — 0 viewers
Hourly Twitch viewers (census snapshots).

Completion

5
achievements tracked
80.2%
earned "Into the Deep End"
35.5%
median achievement earned by

Global achievement rates from Steam.

Details

WindowsSingle-playerMulti-playerCo-opOnline Co-opSteam AchievementsSteam Trading CardsSteam WorkshopAdjustable Text SizeCamera ComfortCustom Volume Controls7 DLC

8 supported languages: English, Simplified Chinese, Korean, German, Japanese, Russian, Spanish - Spain, Portuguese - Portugal

Console footprint

PlatformPlayers trackedCompletionTrophies/achievements
Steam (Steam)3,1658%5

Players tracked by Exophase (achievement/trophy trackers) — a sample of the player base, not total sales.

Player tags

RTSGoreIndieActionSandboxZombiesBuildingStrategySurvivalTactical

Census log

Computed from census-recorded observations only — dates are observation dates.

Recent updates

Players also track

Star Control®: OriginsSurvivalistMedieval Kingdom WarsForce of NatureRatty CattyAncient CitiesBad North: Jotunn EditionCHANGE: A Homeless Survival Experience

Similarity via IGDB.

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