Aliens

Half-Life

Steam

Release date · 1998-11-19

595 last observed players
2026-10-16 11:28 UTC ↗

XCOM: Enemy Unknown

Steam

Release date · 2012-10-11

513 last observed players
2026-10-15 14:12 UTC ↗

Alien: Isolation

GOG Steam

Release date · 2014-10-06

388 last observed players
2026-10-17 16:16 UTC ↗

The Message from Deep Space

Steam

Release date · 2026-06-29

269 last observed players
2026-10-17 18:52 UTC ↗

Sid Meier's Civilization®: Beyond Earth™

Steam

Release date · 2014-10-23

198 last observed players
2026-10-16 01:36 UTC ↗

Serious Sam 3: BFE

Steam

Release date · 2011-11-22

119 last observed players
2026-10-16 19:19 UTC ↗

Aliens vs. Predator™

Steam

Release date · 2010-02-16

111 last observed players
2026-10-16 15:32 UTC ↗

Half-Life: Opposing Force

Steam

Release date · 1999-11-01

57 last observed players
2026-10-16 08:08 UTC ↗

Defense Grid: The Awakening

Steam

Release date · 2008-12-08

53 last observed players
2026-10-16 22:30 UTC ↗

Insaniquarium Deluxe

Steam

Release date · 2006-08-30

52 last observed players
2026-10-16 11:46 UTC ↗

XCOM®: Chimera Squad

GOG Steam

Release date · 2020-04-23

49 last observed players
2026-10-15 14:14 UTC ↗

Half-Life 2: Episode Two

Steam

Release date · 2007-10-10

48 last observed players
2026-10-15 22:35 UTC ↗

Aliens: Colonial Marines Collection

Steam

Release date · 2012-05-01

43 last observed players
2026-10-17 18:53 UTC ↗

X-COM: UFO Defense

GOG Steam

Release date · 2008-09-04

35 last observed players
2026-10-16 13:36 UTC ↗

Alien Shooter 2: Reloaded

GOG Steam

Release date · 2009-05-27

24 last observed players
2026-10-17 04:51 UTC ↗

Half-Life: Blue Shift

Steam

Release date · 2001-06-01

23 last observed players
2026-10-16 08:09 UTC ↗

Alien Swarm

Steam

Release date · 2010-07-19

18 last observed players
2026-10-16 08:13 UTC ↗

Duke Nukem Forever

Steam

Release date · 2011-06-09

17 last observed players
2026-10-17 06:36 UTC ↗

Alien Shooter

Steam

Release date · 2009-05-27

17 last observed players
2026-10-17 04:50 UTC ↗

Crysis 2 - Maximum Edition

Steam

Release date · 2011-03-22

17 last observed players
2026-10-16 16:01 UTC ↗

The Bureau: XCOM Declassified

GOG Steam

Release date · 2013-08-22

12 last observed players
2026-10-15 23:38 UTC ↗

X-COM: Apocalypse

GOG Steam

Release date · 2008-09-04

12 last observed players
2026-10-16 12:18 UTC ↗

X-COM: Terror From the Deep

GOG Steam

Release date · 2007-05-04

12 last observed players
2026-10-16 13:30 UTC ↗

Natural Selection 2

Steam

Release date · 2012-10-30

10 last observed players
2026-10-16 10:09 UTC ↗

Crysis Warhead®

EA app Steam

Release date · 2008-09-17

8 last observed players
2026-10-16 22:00 UTC ↗

Warhammer 40,000: Armageddon (Classic)

Steam

Release date · 2014-11-26

8 last observed players
2026-10-16 19:13 UTC ↗

Half-Life 2: Episode One

Steam

Release date · 2006-06-01

6 last observed players
2026-10-15 22:34 UTC ↗

Directive 8020

Steam

Release date · 2026-05-12

5 last observed players
2026-10-15 12:57 UTC ↗

Aliens versus Predator Classic 2000

GOG Steam

Release date · 2010-01-15

4 last observed players
2026-10-16 12:09 UTC ↗

Earth Defense Force: Insect Armageddon

Steam

Release date · 2011-12-14

4 last observed players
2026-10-17 00:21 UTC ↗

Alien Shooter: Revisited

Steam

Release date · 2009-05-27

4 last observed players
2026-10-17 04:50 UTC ↗

We Need More Humans!

Steam

Release date · 2026-09-01

4 last observed players
2026-10-15 12:43 UTC ↗

Halo: Spartan Strike

Steam

Release date · 2015-04-16

3 last observed players
2026-10-15 23:18 UTC ↗

The Maw

Steam

Release date · 2009-03-09

3 last observed players
2026-10-17 02:41 UTC ↗

Red Faction®: Armageddon™

Steam

Release date · 2011-06-09

3 last observed players
2026-10-17 12:05 UTC ↗

Alien Breed: Impact

GOG Steam

Release date · 2010-06-03

2 last observed players
2026-10-16 23:56 UTC ↗