The Game Census
Killing Floor cover art

Killing Floor

Tripwire Interactive · 2009-05-14

Steam

Action

Modes: Single player, Multiplayer, Co-operative · Perspectives: First person

Releases: Nov 2012 (Linux), May 14, 2009 (PC (Microsoft Windows)), May 19, 2010 (Mac)

6-player co-op survival horror at its finest! Free updates, free special events and a ridiculous amount of fun!

Killing Floor is an Action game released in 2009, priced at $19.99, with an estimated 2,000,000 .. 5,000,000 owners and a review sentiment of Overwhelmingly Positive (95% of 68937 reviews).

122
playing now
95%
positive of 69k reviews
Overwhelmingly Positive
steam's rating (official)
2,000,000–5,000,000
owners (SteamSpy est.)
68/100
critic score (5 outlets, IGDB)
73/100
IGDB user rating (164 ratings)
22
Nexus mods (541 downloads)
60h
to beat · rushed 35h
platinum
deck/linux tier (ProtonDB)
Playable
Steam Deck (Valve)
SteamOS: Playable
$19.99
steam price (US)

122 players in-game as of 2026-10-14 10:00 UTC (census sample)

Killing Floor is a cooperative first-person shooter video game developed and published by Tripwire Interactive. It was originally released as an Unreal Tournament 2004 mod in 2005. A full retail release followed on May 14, 2009, for Microsoft Windows, and for OS X on May 5, 2010. A version for Linux was released via Steam in November 2012.

Trailer

Killing Floor trailer thumbnail

The Killing Floor (1984) | Trailer | Damien Leake | Alfre Woodard | Dennis Farina

≈1,000,000 YouTube results for this game's trailer search

Health check

Healthy
  • · 122 players in-game at the last census sample.
  • · 824 reviews in the last 8 weeks (~103/week).
  • · Review velocity down 30% vs the prior 8 weeks.
  • · Top 2% of 27,533 Action games in the census by review count.

Health tier since 2026-08-29

Estimated sales: 2.8M–5.5M copies

Review-multiple estimate from 68,987 total reviews — how this is computed.

Current store prices

Steam$1.99-90%
GamersGate$4.00-80%

Deal snapshots via CheapShark, refreshed daily.

All-time low: $0.80 at GreenManGaming (2019-04-10) · bundled 20×via IsThereAnyDeal

12-month high $19.99 · on sale 66 of 81 observed days · $3.20 above the all-time low (census price snapshots)

Review momentum

PositiveNegative
28528520182026Week of 2018-03-01: 95 positiveWeek of 2018-03-01: 7 negativeWeek of 2018-04-01: 110 positiveWeek of 2018-04-01: 11 negativeWeek of 2018-05-01: 71 positiveWeek of 2018-05-01: 9 negativeWeek of 2018-06-01: 115 positiveWeek of 2018-06-01: 11 negativeWeek of 2018-07-01: 105 positiveWeek of 2018-07-01: 7 negativeWeek of 2018-08-01: 79 positiveWeek of 2018-08-01: 9 negativeWeek of 2018-09-01: 93 positiveWeek of 2018-09-01: 6 negativeWeek of 2018-10-01: 75 positiveWeek of 2018-10-01: 2 negativeWeek of 2018-11-01: 232 positiveWeek of 2018-11-01: 6 negativeWeek of 2018-12-01: 105 positiveWeek of 2018-12-01: 12 negativeWeek of 2019-01-01: 78 positiveWeek of 2019-01-01: 6 negativeWeek of 2019-02-01: 64 positiveWeek of 2019-02-01: 8 negativeWeek of 2019-03-01: 56 positiveWeek of 2019-03-01: 5 negativeWeek of 2019-04-01: 43 positiveWeek of 2019-04-01: 9 negativeWeek of 2019-05-01: 94 positiveWeek of 2019-05-01: 17 negativeWeek of 2019-06-01: 280 positiveWeek of 2019-06-01: 16 negativeWeek of 2019-07-01: 242 positiveWeek of 2019-07-01: 8 negativeWeek of 2019-08-01: 52 positiveWeek of 2019-08-01: 7 negativeWeek of 2019-09-01: 34 positiveWeek of 2019-09-01: 3 negativeWeek of 2019-10-01: 139 positiveWeek of 2019-10-01: 10 negativeWeek of 2019-11-01: 285 positiveWeek of 2019-11-01: 7 negativeWeek of 2019-12-01: 221 positiveWeek of 2019-12-01: 11 negativeWeek of 2020-01-01: 161 positiveWeek of 2020-01-01: 5 negativeWeek of 2020-02-01: 101 positiveWeek of 2020-02-01: 3 negativeWeek of 2020-03-01: 146 positiveWeek of 2020-03-01: 10 negativeWeek of 2020-04-01: 169 positiveWeek of 2020-04-01: 9 negativeWeek of 2020-05-01: 107 positiveWeek of 2020-05-01: 4 negativeWeek of 2020-06-01: 227 positiveWeek of 2020-06-01: 13 negativeWeek of 2020-07-01: 178 positiveWeek of 2020-07-01: 8 negativeWeek of 2020-08-01: 96 positiveWeek of 2020-08-01: 7 negativeWeek of 2020-09-01: 121 positiveWeek of 2020-09-01: 11 negativeWeek of 2020-10-01: 153 positiveWeek of 2020-10-01: 9 negativeWeek of 2020-11-01: 164 positiveWeek of 2020-11-01: 8 negativeWeek of 2020-12-01: 138 positiveWeek of 2020-12-01: 12 negativeWeek of 2021-01-01: 128 positiveWeek of 2021-01-01: 7 negativeWeek of 2021-02-01: 100 positiveWeek of 2021-02-01: 4 negativeWeek of 2021-03-01: 94 positiveWeek of 2021-03-01: 8 negativeWeek of 2021-04-01: 99 positiveWeek of 2021-04-01: 4 negativeWeek of 2021-05-01: 76 positiveWeek of 2021-05-01: 7 negativeWeek of 2021-06-01: 135 positiveWeek of 2021-06-01: 5 negativeWeek of 2021-07-01: 116 positiveWeek of 2021-07-01: 5 negativeWeek of 2021-08-01: 89 positiveWeek of 2021-08-01: 6 negativeWeek of 2021-09-01: 144 positiveWeek of 2021-09-01: 158 negativeWeek of 2021-10-01: 168 positiveWeek of 2021-10-01: 22 negativeWeek of 2021-11-01: 136 positiveWeek of 2021-11-01: 14 negativeWeek of 2021-12-01: 169 positiveWeek of 2021-12-01: 7 negativeWeek of 2022-01-01: 139 positiveWeek of 2022-01-01: 11 negativeWeek of 2022-02-01: 90 positiveWeek of 2022-02-01: 6 negativeWeek of 2022-03-01: 111 positiveWeek of 2022-03-01: 12 negativeWeek of 2022-04-01: 85 positiveWeek of 2022-04-01: 3 negativeWeek of 2022-05-01: 66 positiveWeek of 2022-05-01: 3 negativeWeek of 2022-06-01: 77 positiveWeek of 2022-06-01: 4 negativeWeek of 2022-07-01: 81 positiveWeek of 2022-07-01: 7 negativeWeek of 2022-08-01: 60 positiveWeek of 2022-08-01: 2 negativeWeek of 2022-09-01: 74 positiveWeek of 2022-09-01: 10 negativeWeek of 2022-10-01: 90 positiveWeek of 2022-10-01: 3 negativeWeek of 2022-11-01: 90 positiveWeek of 2022-11-01: 3 negativeWeek of 2022-12-01: 109 positiveWeek of 2022-12-01: 9 negativeWeek of 2023-01-01: 117 positiveWeek of 2023-01-01: 5 negativeWeek of 2023-02-01: 64 positiveWeek of 2023-02-01: 5 negativeWeek of 2023-03-01: 89 positiveWeek of 2023-03-01: 12 negativeWeek of 2023-04-01: 65 positiveWeek of 2023-04-01: 7 negativeWeek of 2023-05-01: 60 positiveWeek of 2023-05-01: 6 negativeWeek of 2023-06-01: 91 positiveWeek of 2023-06-01: 12 negativeWeek of 2023-07-01: 111 positiveWeek of 2023-07-01: 4 negativeWeek of 2023-08-01: 75 positiveWeek of 2023-08-01: 7 negativeWeek of 2023-09-01: 115 positiveWeek of 2023-09-01: 7 negativeWeek of 2023-10-01: 122 positiveWeek of 2023-10-01: 5 negativeWeek of 2023-11-01: 117 positiveWeek of 2023-11-01: 8 negativeWeek of 2023-12-01: 96 positiveWeek of 2023-12-01: 8 negativeWeek of 2024-01-01: 62 positiveWeek of 2024-01-01: 4 negativeWeek of 2024-02-01: 61 positiveWeek of 2024-02-01: 4 negativeWeek of 2024-03-01: 55 positiveWeek of 2024-03-01: 3 negativeWeek of 2024-04-01: 59 positiveWeek of 2024-04-01: 4 negativeWeek of 2024-05-01: 232 positiveWeek of 2024-05-01: 34 negativeWeek of 2024-06-01: 136 positiveWeek of 2024-06-01: 13 negativeWeek of 2024-07-01: 137 positiveWeek of 2024-07-01: 7 negativeWeek of 2024-08-01: 91 positiveWeek of 2024-08-01: 10 negativeWeek of 2024-09-01: 92 positiveWeek of 2024-09-01: 6 negativeWeek of 2024-10-01: 61 positiveWeek of 2024-10-01: 5 negativeWeek of 2024-11-01: 121 positiveWeek of 2024-11-01: 14 negativeWeek of 2024-12-01: 210 positiveWeek of 2024-12-01: 19 negativeWeek of 2025-01-01: 117 positiveWeek of 2025-01-01: 7 negativeWeek of 2025-02-01: 136 positiveWeek of 2025-02-01: 7 negativeWeek of 2025-03-01: 194 positiveWeek of 2025-03-01: 27 negativeWeek of 2025-04-01: 68 positiveWeek of 2025-04-01: 9 negativeWeek of 2025-05-01: 74 positiveWeek of 2025-05-01: 10 negativeWeek of 2025-06-01: 96 positiveWeek of 2025-06-01: 9 negativeWeek of 2025-07-01: 186 positiveWeek of 2025-07-01: 16 negativeWeek of 2025-08-01: 151 positiveWeek of 2025-08-01: 8 negativeWeek of 2025-09-01: 178 positiveWeek of 2025-09-01: 13 negativeWeek of 2025-10-01: 131 positiveWeek of 2025-10-01: 17 negativeWeek of 2025-11-01: 118 positiveWeek of 2025-11-01: 6 negativeWeek of 2025-12-01: 143 positiveWeek of 2025-12-01: 12 negativeWeek of 2026-01-01: 88 positiveWeek of 2026-01-01: 5 negativeWeek of 2026-02-01: 84 positiveWeek of 2026-02-01: 4 negativeWeek of 2026-03-01: 93 positiveWeek of 2026-03-01: 5 negativeWeek of 2026-04-01: 115 positiveWeek of 2026-04-01: 10 negativeWeek of 2026-05-01: 129 positiveWeek of 2026-05-01: 16 negativeWeek of 2026-06-01: 109 positiveWeek of 2026-06-01: 6 negativeWeek of 2026-07-01: 88 positiveWeek of 2026-07-01: 18 negativeWeek of 2026-08-01: 84 positiveWeek of 2026-08-01: 6 negativeWeek of 2026-09-01: 55 positiveWeek of 2026-09-01: 2 negativeWeek of 2026-10-01: 32 positive
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

328932026-09-14 20:00 — 237 players2026-09-16 04:00 — 132 players2026-09-17 11:00 — 130 players2026-09-18 19:00 — 259 players2026-09-20 02:00 — 215 players2026-09-21 10:00 — 127 players2026-09-22 18:00 — 244 players2026-09-24 01:00 — 173 players2026-09-25 09:00 — 116 players2026-09-26 16:00 — 288 players2026-09-28 00:00 — 200 players2026-09-29 07:00 — 95 players2026-09-30 15:00 — 184 players2026-10-01 22:00 — 151 players2026-10-03 06:00 — 181 players2026-10-04 14:00 — 262 players2026-10-05 21:00 — 230 players2026-10-07 05:00 — 146 players2026-10-08 12:00 — 203 players2026-10-09 20:00 — 307 players2026-10-11 03:00 — 240 players2026-10-12 11:00 — 118 players2026-10-13 19:00 — 249 players2026-10-14 10:00 — 122 players
Concurrent players, hourly average, last 30 days (census samples).
7.1k183Jul 2012Aug 2026Jul 2012 — avg 3,498 · peak 6,984Dec 2012 — avg 3,394 · peak 7,186May 2013 — avg 1,845 · peak 3,180Oct 2013 — avg 2,430 · peak 7,453Mar 2014 — avg 1,651 · peak 3,644Aug 2014 — avg 1,940 · peak 3,296Jan 2015 — avg 2,046 · peak 3,707Jun 2015 — avg 1,018 · peak 1,739Nov 2015 — avg 811 · peak 1,677Apr 2016 — avg 607 · peak 1,181Sep 2016 — avg 521 · peak 900Feb 2017 — avg 580 · peak 1,036Jul 2017 — avg 1,617 · peak 4,243Dec 2017 — avg 680 · peak 1,374May 2018 — avg 472 · peak 827Oct 2018 — avg 411 · peak 839Mar 2019 — avg 344 · peak 645Aug 2019 — avg 307 · peak 551Jan 2020 — avg 332 · peak 637Jun 2020 — avg 394 · peak 656Nov 2020 — avg 340 · peak 604Apr 2021 — avg 285 · peak 526Sep 2021 — avg 244 · peak 465Feb 2022 — avg 268 · peak 538Jul 2022 — avg 237 · peak 440Dec 2022 — avg 244 · peak 467May 2023 — avg 193 · peak 399Oct 2023 — avg 241 · peak 544Mar 2024 — avg 205 · peak 420Aug 2024 — avg 213 · peak 463Jan 2025 — avg 271 · peak 535Jun 2025 — avg 227 · peak 436Nov 2025 — avg 264 · peak 568Apr 2026 — avg 232 · peak 497Aug 2026 — avg 205 · peak 381
Monthly average players (source: steamcharts.com) — history via steamcharts.com; live census sampling since Aug 2026.

Price history

$26.32$0.802015-01-012026-10-112015-01-01 — best price $4.492015-03-23 — best price $19.992015-06-04 — best price $4.002015-08-31 — best price $19.992016-01-04 — best price $19.952016-05-26 — best price $4.992016-10-20 — best price $3.992017-02-15 — best price $17.952017-09-14 — best price $19.992018-03-31 — best price $19.992018-10-26 — best price $4.992019-05-14 — best price $4.992019-10-04 — best price $19.992020-01-09 — best price $4.992020-03-27 — best price $19.992020-06-11 — best price $4.392020-09-07 — best price $4.252020-11-05 — best price $4.992021-01-13 — best price $15.892021-03-06 — best price $15.992021-04-29 — best price $19.992021-06-08 — best price $14.692021-08-16 — best price $19.992021-11-06 — best price $15.992022-01-11 — best price $14.692022-05-04 — best price $15.892022-09-01 — best price $4.992023-01-05 — best price $19.992023-04-28 — best price $4.682023-08-25 — best price $4.992024-01-04 — best price $19.992024-05-19 — best price $15.742025-02-10 — best price $19.992025-10-27 — best price $1.992026-04-12 — best price $15.742026-08-06 — best price $1.992026-10-11 — best price $4.00
Lowest recorded price across tracked stores, per day (census snapshots).

Attention

164562026-05-31 — 76 pageviews2026-06-04 — 127 pageviews2026-06-08 — 78 pageviews2026-06-12 — 91 pageviews2026-06-16 — 56 pageviews2026-06-20 — 61 pageviews2026-06-24 — 80 pageviews2026-06-28 — 102 pageviews2026-07-02 — 112 pageviews2026-07-06 — 90 pageviews2026-07-10 — 121 pageviews2026-07-14 — 91 pageviews2026-07-18 — 85 pageviews2026-07-22 — 110 pageviews2026-07-26 — 159 pageviews2026-07-30 — 86 pageviews2026-08-03 — 99 pageviews2026-08-07 — 92 pageviews2026-08-11 — 94 pageviews2026-08-15 — 124 pageviews2026-08-19 — 110 pageviews2026-08-23 — 118 pageviews2026-08-27 — 99 pageviews2026-08-31 — 80 pageviews2026-09-04 — 107 pageviews2026-09-08 — 105 pageviews2026-09-12 — 107 pageviews2026-09-16 — 111 pageviews2026-09-20 — 109 pageviews2026-09-24 — 115 pageviews2026-09-28 — 93 pageviews2026-10-02 — 94 pageviews2026-10-06 — 106 pageviews2026-10-10 — 73 pageviews
Daily Wikipedia pageviews (attention proxy, census-recorded).

Twitch viewers

1602026-10-02 14:34 — 16 viewers2026-10-03 23:34 — 0 viewers2026-10-04 01:34 — 2 viewers2026-10-04 03:34 — 3 viewers2026-10-04 05:34 — 0 viewers2026-10-04 07:34 — 0 viewers2026-10-04 09:34 — 0 viewers2026-10-04 11:34 — 0 viewers2026-10-04 13:34 — 0 viewers2026-10-07 22:34 — 0 viewers2026-10-08 00:34 — 0 viewers2026-10-08 02:34 — 4 viewers2026-10-08 04:34 — 0 viewers2026-10-08 06:34 — 0 viewers2026-10-08 08:34 — 0 viewers2026-10-08 10:34 — 0 viewers2026-10-08 12:34 — 15 viewers2026-10-09 21:34 — 2 viewers2026-10-09 23:35 — 0 viewers2026-10-10 01:34 — 4 viewers2026-10-10 03:34 — 5 viewers2026-10-10 05:34 — 0 viewers2026-10-10 07:34 — 0 viewers2026-10-10 09:34 — 0 viewers2026-10-10 11:34 — 0 viewers2026-10-12 00:34 — 0 viewers2026-10-12 02:34 — 0 viewers2026-10-12 04:34 — 2 viewers2026-10-12 06:34 — 0 viewers2026-10-12 08:34 — 0 viewers2026-10-12 10:34 — 0 viewers2026-10-13 19:34 — 0 viewers
Hourly Twitch viewers (census snapshots).

Completion

60+
achievements tracked
66.7%
earned "Experimenticenticide"
16.6%
median achievement earned by

Global achievement rates from Steam.

Details

WindowsmacOSLinuxSingle-playerMulti-playerCo-opCross-Platform MultiplayerSteam AchievementsSteam Trading CardsSteam WorkshopValve Anti-Cheat enabledStatsIncludes level editor21 DLC

7 supported languages: English, French, Italian, German, Spanish - Spain, Hungarian, Polish

Post-launch support: 21 DLC released, first 2009-07-24, latest 2014-07-02 (Steam store data)

Console footprint

PlatformPlayers trackedCompletionTrophies/achievements
Steam (Steam)128,3012%285

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

Where its players are

Share of Steam reviews by language (top languages measured) — a proxy for where the player base lives.

Player tags

FPSGoreCo-opActionHorrorShooterViolentZombiesModdableSurvival

Census log

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

Players also track

Left 4 DeadRogue WarriorCall of Duty®: GhostsDying LightEnemy FrontGET EVENZiggurat

Similarity via IGDB.

Official site ↗Wikipedia ↗