Games like Grey Goo on Steam
For those who prefer not to search, lists of the most played, top deals and best free games like Grey Goo are available at the bottom of the page.
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Zero-K
With 100+ truly unique units, Zero-K is an RTS of freedom and creativity, tempered by a decade of refinement. Sculpt land into a castle and throw invaders off it with a Jugglenaut. Explore a massive campaign, solo or co-op. Hop online for epic 32 player battles or fast paced 1v1, on 100s of maps.
Sins of a Solar Empire II
Battle for galactic dominance in this real-time 4X strategy game with unrivaled scale! You’ll explore, expand, exploit, and exterminate through military force, diplomacy, trade, culture, influence, and other underhanded tactics.
Silica
Silica blends FPS and RTS in epic, photorealistic battles. Choose to fight on the ground or command from above as humans or aliens. Dive into thrilling multiplayer combat or master strategic command. Are you ready to survive and conquer?
Rusted Warfare - RTS
{{An RTS inspired by the classics of the past!}} Making up for it's subpar retro graphics with fun gameplay and modern multi-threaded tech enabling huge battles to run smooth... Featuring singleplayer challenges, skirmish, sandbox, 10-player multiplayer & workshop modding.
Ashes of the Singularity: Escalation
A massive-scale real-time strategy game where you command entire armies on a dynamic battlefield. Conquer multiple worlds across several single-player campaigns; or play with your friends in multiplayer combat.
ENDLESS™ Space - Definitive Edition
ENDLESS™ Space is a turn-based 4X strategy game, covering the space colonization age in the Endless universe, where you can control every aspect of your civilization as you strive for galactic domination.
AirMech
AirMech® Strike is a fast paced Action-RTS game that can be played solo, coop, or competitively online. Earn Kudos and Experience in battle and unlock a wide collection of AirMechs and Units while you practice the perfect strategy to emerge victorious!
Surviving Mars
There will be challenges to overcome. Execute your strategy and improve your colony’s chances of survival while unlocking the mysteries of this alien world. Are you ready? Mars is waiting for you.
Halo: Spartan Assault
Halo: Spartan Assault brings the excitement of Halo combat to Steam for the very first time. Battle your way through 30 action-packed missions against the Covenant as you explore the origin of the Spartan Ops program featured in Halo 4. *DirectX feature level 10 required. *
DG2: Defense Grid 2
Setting the bar as the definitive tower defense game, Defense Grid 2 introduces new worlds and threats to test your tower placement strategies. With a bold new look and the addition of new game modes, player-versus-player and multiplayer co-op, every play brings fun new opportunities and challenges.
Satellite Reign
Satellite Reign is a real-time, class-based strategy game, set in an open-world cyberpunk city. You command a group of 4 agents through rain-soaked, neon-lit streets, where the law is the will of mega-corporations.
Warhammer 40,000: Dawn of War II - Anniversary Edition
All of Warhammer 40,000: Dawn of War II in one package. Play the award-winning real-time strategy game in all its glory, including three full campaigns, six multiplayer factions, and a full co-op Last Stand mode with eight unique heroes.
Battlezone 98 Redux
One of the greatest sci-fi strategy games of all time returns with remastered visuals, online multiplayer and near unlimited mod content from Steam Workshop. Experience thrilling first person action and acclaimed RTS in this explosive alternate vision of the 1960s space race.
Star Ruler
Take command of a vast interstellar empire and safeguard your species from total extinction in a procedurally generated 3D galaxy (with the option to flatten it) from 1 System to 10,000+! Prove your species' ingenuity through a deep and intricate combat system where anything (from individual components on ships to the stars themselves)...
AI War: Fleet Command
"You are outgunned. You are massively outnumbered. You must win." These are your orders. Humanity has already fought its war against the machines -- and lost. AI death squads stand watch over every planet and every wormhole, the few remaining human settlements are held captive in orbiting bubbles, and the AIs have turned their...
Battlefleet Gothic: Armada
Battlefleet Gothic: Armada is the RTS videogame adaptation of Games Workshop’s classic tabletop game, pitting the Chaos, Imperium, Eldar, and Orks against each other in visceral space-battles.
The Red Solstice
2280 A.D. The last few survivors of a ruined Earth seek a new home: Mars, a planet whose inhabitants didn't take too kindly to outsiders. The Red Solstice is a tense, tactical, squad-based action game. Fight to survive with up to 8 players in co-op, or lead your own squad in single-player mode.
STAR WARS™ Empire at War - Gold Pack
Command or corrupt an entire galaxy in the definitive Star Wars strategy collection. It is a time of galactic civil war. Will you take up the reins of the Rebellion, assume control of the Empire, or rule the Star Wars Underworld?
Alien Marauder
“Alien Marauder” is a real-time strategy game with survival and confrontation theme. In this game, you will be the leader to a treacherous alien planet, build and defend base to survive against the vexan waves. Make the right decision!
Sins of a Solar Empire®: Rebellion
Command a space-faring empire in Sins of a Solar Empire: Rebellion, the new stand-alone expansion that combines 4X depth with real-time strategy gameplay.
Exogate Initiative
Build and manage mankind’s first mission across the universe! Create a sprawling facility underground, recruit a diverse group of specialists from around the globe and explore mysterious new worlds through the Exogate.
XCOM: Enemy Unknown
The XCOM: Enemy Unknown - Slingshot Pack is Now Available!
Revenge of the Titans
The ultimate mash-up of Real-time Strategy and Tower Defense!Most played games like Grey Goo on Steam
Take a look at the top games like Grey Goo that are currently attracting the largest player bases on the Steam platform, as of April 15th 2025.
1. Age of Empires II: Definitive Edition
Similarity 52% 42 Civilizations, 229 Campaign Missions, Singleplayer, Co-Op, Multiplayer, In-Game Editor, Mods, Cross-play...It is good to be the king. Age of Empires II: Definitive Edition is a strategy, rts and city builder game developed by Forgotten Empires, Tantalus Media, Wicked Witch, World's Edge and CaptureAge and published by Xbox Game Studios. Released on November 14th 2019 has received 159,608 reviews of which 151,527 were positive and 8,081 were negative resulting in an impressive rating of 9.4 out of 10. The game has hit the top spot as the #1 most played game like Grey Goo, thanks to its 28,305 peak concurrent players over the last day.
9.4
151,527
8,081
28,305
players
2. Company of Heroes 2
Similarity 52% Experience the ultimate WWII RTS platform with COH2 and its standalone expansions. This package includes the base game, which you can then upgrade by purchasing The Western Front Armies, Ardennes Assault and/or The British Forces. More info in the "About This Game" section below. Company of Heroes 2 is a strategy, world war ii and rts game developed by Relic Entertainment and Feral Interactive (Linux) and published by Relic Entertainment, Feral interactive (Mac) and Feral Interactive (Linux). Released on June 25th 2013 has received 109,353 reviews of which 86,351 were positive and 23,002 were negative resulting in a rating of 7.8 out of 10. While seeing 5,110 players online at once in the last 24 hours, this game is currently ranked #2 among games like Grey Goo based on player count.
7.8
86,351
23,002
5,110
players
3. STAR WARS™ Empire at War - Gold Pack
Similarity 56% Command or corrupt an entire galaxy in the definitive Star Wars strategy collection. It is a time of galactic civil war. Will you take up the reins of the Rebellion, assume control of the Empire, or rule the Star Wars Underworld? STAR WARS™ Empire at War - Gold Pack is a strategy, rts and space game developed by Petroglyph and published by LucasArts, Lucasfilm and Disney. Released on May 25th 2010 has received 38,771 reviews of which 37,851 were positive and 920 were negative resulting in an impressive rating of 9.6 out of 10. While seeing 1,987 players online at once in the last 24 hours, this game is currently ranked #3 among games like Grey Goo based on player count.
9.6
37,851
920
1,987
players
4. BATTLETECH
Similarity 62% Take command of your own mercenary outfit of 'Mechs and the MechWarriors that pilot them, struggling to stay afloat as you find yourself drawn into a brutal interstellar civil war. BATTLETECH is a mechs, strategy and turn-based tactics game developed by Harebrained Schemes and published by Paradox Interactive. Released on April 24th 2018 has received 31,337 reviews of which 26,233 were positive and 5,104 were negative resulting in a rating of 8.2 out of 10. With 1,901 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played games like Grey Goo.
8.2
26,233
5,104
1,901
players
5. Supreme Commander: Forged Alliance
Similarity 74% The last days of man are at hand.. Two years after the Infinite War the once great warring nations now lie in ruins, and humanity’s hope for a brighter future is nothing but a bitter memory. A new, seemingly unstoppable enemy, supported by the zealots of The Order, now seeks to eradicate mankind: UEF, Aeon Loyalist, and Cybran alike. Supreme Commander: Forged Alliance is a strategy, rts and sci-fi game developed by Gas Powered Games and published by Square Enix. Released on September 28th 2011 has received 13,370 reviews of which 12,950 were positive and 420 were negative resulting in an impressive rating of 9.4 out of 10. With 1,096 concurrent players in the last 24 hours, the game currently holds the #5 spot among the most played games like Grey Goo.
9.4
12,950
420
1,096
players
6. XCOM: Enemy Unknown
Similarity 55% The XCOM: Enemy Unknown - Slingshot Pack is Now Available! XCOM: Enemy Unknown is a turn-based strategy, tactical and strategy game developed by Firaxis Games and Feral Interactive (Linux) and published by Feral Interactive (Linux) and 2K. Released on October 11th 2012 has received 56,136 reviews of which 52,466 were positive and 3,670 were negative resulting in an impressive rating of 9.2 out of 10. With 969 concurrent players in the last 24 hours, the game currently holds the #6 spot among the most played games like Grey Goo.
9.2
52,466
3,670
969
players
7. Surviving Mars
Similarity 58% There will be challenges to overcome. Execute your strategy and improve your colony’s chances of survival while unlocking the mysteries of this alien world. Are you ready? Mars is waiting for you. Surviving Mars is a colony sim, city builder and strategy game developed by Haemimont Games and Abstraction and published by Paradox Interactive. Released on March 15th 2018 has received 26,404 reviews of which 22,330 were positive and 4,074 were negative resulting in a rating of 8.3 out of 10. With 923 concurrent players in the last 24 hours, the game currently holds the #7 spot among the most played games like Grey Goo.
8.3
22,330
4,074
923
players
8. Age of Empires: Definitive Edition
Similarity 52% Age of Empires, the pivotal real-time strategy game that launched a 20-year legacy returns with modernized gameplay, all-new 4K visuals, 8-person multiplayer battles and a host of other new features. Welcome back to history. Age of Empires: Definitive Edition is a strategy, rts and multiplayer game developed by Forgotten Empires and Tantalus and published by Xbox Game Studios. Released on August 19th 2019 has received 13,711 reviews of which 11,512 were positive and 2,199 were negative resulting in a rating of 8.2 out of 10. With 919 concurrent players in the last 24 hours, the game currently holds the #8 spot among the most played games like Grey Goo.
8.2
11,512
2,199
919
players
9. Rise of Nations: Extended Edition
Similarity 52% Rise of Nations is back! Play the updated classic with full Steamworks integration and enhanced features! Rise of Nations: Extended Edition is a strategy, rts and classic game developed by SkyBox Labs and Big Huge Games and published by Xbox Game Studios. Released on June 12th 2014 has received 14,596 reviews of which 13,820 were positive and 776 were negative resulting in an impressive rating of 9.2 out of 10. With 887 concurrent players in the last 24 hours, the game currently holds the #9 spot among the most played games like Grey Goo.
9.2
13,820
776
887
players
10. Sins of a Solar Empire II
Similarity 59% Battle for galactic dominance in this real-time 4X strategy game with unrivaled scale! You’ll explore, expand, exploit, and exterminate through military force, diplomacy, trade, culture, influence, and other underhanded tactics. Sins of a Solar Empire II is a space, strategy and 4x game developed by Stardock Entertainment and Ironclad Games Corporation and published by Stardock Entertainment. Released on August 15th 2024 has received 6,693 reviews of which 5,753 were positive and 940 were negative resulting in a rating of 8.3 out of 10. With 831 concurrent players in the last 24 hours, the game currently holds the #10 spot among the most played games like Grey Goo.
8.3
5,753
940
831
players
Best deals on games like Grey Goo on Steam
Discover fantastic savings with the best discounts on a variety of games like Grey Goo available on Steam right now, updated on April 15th 2025. Looking for even more deals? Use the search filters to explore a wider range of discounted games like Grey Goo.
1. Ancestors Legacy
Similarity 52% Ancestors Legacy is a squad-based real time strategy with a strong focus on tactics. Inspired by medieval European history, it brings to life four different nations and their conflicts, usually solved by war. Ancestors Legacy is a strategy, rts and medieval game developed and published by Destructive Creations. Released on May 22nd 2018 has received 8,335 reviews of which 6,569 were positive and 1,766 were negative resulting in a rating of 7.7 out of 10. Featuring a massive 95% discount, this game currently holds the #1 spot in the best deals for games like Grey Goo.
7.7
6,569
1,766
-95%
37.20€
1.86€
2. Homeworld Remastered Collection
Similarity 65% Experience the epic space strategy games that redefined the RTS genre. Control your fleet and build an armada across more than 30 single-player missions. Choose unit types, fleet formations and flight tactics for each strategic situation. Homeworld Remastered Collection is a space, strategy and rts game developed by Gearbox Software and Aspyr (Mac) and published by Aspyr (Mac) and Gearbox Publishing. Released on February 25th 2015 has received 13,504 reviews of which 11,934 were positive and 1,570 were negative resulting in a rating of 8.6 out of 10. Thanks to its incredible 94% discount, this game is now the #2 best deal in games like Grey Goo.
8.6
11,934
1,570
-94%
33.33€
2.00€
3. Ashes of the Singularity: Escalation
Similarity 59% A massive-scale real-time strategy game where you command entire armies on a dynamic battlefield. Conquer multiple worlds across several single-player campaigns; or play with your friends in multiplayer combat. Ashes of the Singularity: Escalation is a rts, base-building and pvp game developed by Stardock Entertainment and Oxide Games and published by Stardock Entertainment. Released on November 10th 2016 has received 4,738 reviews of which 3,526 were positive and 1,212 were negative resulting in a rating of 7.3 out of 10. Thanks to its incredible 94% discount, this game is now the #3 best deal in games like Grey Goo.
7.3
3,526
1,212
-94%
29.17€
1.75€
4. XCOM: Enemy Unknown
Similarity 55% The XCOM: Enemy Unknown - Slingshot Pack is Now Available! XCOM: Enemy Unknown is a turn-based strategy, tactical and strategy game developed by Firaxis Games and Feral Interactive (Linux) and published by Feral Interactive (Linux) and 2K. Released on October 11th 2012 has received 56,136 reviews of which 52,466 were positive and 3,670 were negative resulting in an impressive rating of 9.2 out of 10. Currently offered at a significant 92% discount, this title has earned the #4 position in the best deals for games like Grey Goo.
9.2
52,466
3,670
-92%
18.75€
1.50€
5. Company of Heroes 2
Similarity 52% Experience the ultimate WWII RTS platform with COH2 and its standalone expansions. This package includes the base game, which you can then upgrade by purchasing The Western Front Armies, Ardennes Assault and/or The British Forces. More info in the "About This Game" section below. Company of Heroes 2 is a strategy, world war ii and rts game developed by Relic Entertainment and Feral Interactive (Linux) and published by Relic Entertainment, Feral interactive (Mac) and Feral Interactive (Linux). Released on June 25th 2013 has received 109,353 reviews of which 86,351 were positive and 23,002 were negative resulting in a rating of 7.8 out of 10. Currently offered at a significant 88% discount, this title has earned the #5 position in the best deals for games like Grey Goo.
7.8
86,351
23,002
-88%
19.50€
2.34€
6. Iron Harvest
Similarity 63% A classic real-time strategy game with an epic single player campaign, multiplayer & coop, set in the alternate reality of 1920+ Iron Harvest is a rts, strategy and base-building game developed by KING Art and published by Prime Matter. Released on August 31st 2020 has received 14,947 reviews of which 10,857 were positive and 4,090 were negative resulting in a rating of 7.1 out of 10. Currently offered at a significant 85% discount, this title has earned the #6 position in the best deals for games like Grey Goo.
7.1
10,857
4,090
-85%
29.99€
4.49€
7. Battlefleet Gothic: Armada
Similarity 56% Battlefleet Gothic: Armada is the RTS videogame adaptation of Games Workshop’s classic tabletop game, pitting the Chaos, Imperium, Eldar, and Orks against each other in visceral space-battles. Battlefleet Gothic: Armada is a strategy, warhammer 40k and space game developed by Tindalos Interactive and published by Focus Entertainment. Released on April 21st 2016 has received 5,796 reviews of which 3,970 were positive and 1,826 were negative resulting in a rating of 6.7 out of 10. Currently offered at a significant 85% discount, this title has earned the #7 position in the best deals for games like Grey Goo.
6.7
3,970
1,826
-85%
14.99€
2.24€
8. SPACECOM
Similarity 62% SPACECOM – a strategic-to-the-bone, starfleet command game in which deception, smart movement, and choices to battle decide victory or defeat. SPACECOM is a rts, strategy and indie game developed by Flow Combine and published by 11 bit studios. Released on September 17th 2014 has received 514 reviews of which 353 were positive and 161 were negative resulting in a rating of 6.6 out of 10. Currently offered at a significant 85% discount, this title has earned the #8 position in the best deals for games like Grey Goo.
6.6
353
161
-85%
9.99€
1.49€
9. Age of Empires: Definitive Edition
Similarity 52% Age of Empires, the pivotal real-time strategy game that launched a 20-year legacy returns with modernized gameplay, all-new 4K visuals, 8-person multiplayer battles and a host of other new features. Welcome back to history. Age of Empires: Definitive Edition is a strategy, rts and multiplayer game developed by Forgotten Empires and Tantalus and published by Xbox Game Studios. Released on August 19th 2019 has received 13,711 reviews of which 11,512 were positive and 2,199 were negative resulting in a rating of 8.2 out of 10. Currently offered at a significant 83% discount, this title has earned the #9 position in the best deals for games like Grey Goo.
8.2
11,512
2,199
-83%
20.00€
3.40€
10. Warhammer 40,000: Dawn of War - Anniversary Edition
Similarity 65% All of Warhammer 40,000: Dawn of War in one glorious package. Play the genre-defining classic real time strategy game in all its blood-soaked glory, including four complete campaigns and nine full-fledged factions. Warhammer 40,000: Dawn of War - Anniversary Edition is a strategy, rts and warhammer 40k game developed by Relic Entertainment and published by SEGA. Released on August 07th 2007 has received 11,043 reviews of which 10,485 were positive and 558 were negative resulting in an impressive rating of 9.2 out of 10. Currently offered at a significant 80% discount, this title has earned the #10 position in the best deals for games like Grey Goo.
9.2
10,485
558
-80%
29.99€
5.99€
Free games like Grey Goo on Steam
Check out this fantastic list of free-to-play games like Grey Goo you can enjoy on Steam right now, updated on April 15th 2025. Looking for even more free titles? Use the search filters to explore a wider range of free to play games like Grey Goo.
1. Zero-K
Similarity 60% With 100+ truly unique units, Zero-K is an RTS of freedom and creativity, tempered by a decade of refinement. Sculpt land into a castle and throw invaders off it with a Jugglenaut. Explore a massive campaign, solo or co-op. Hop online for epic 32 player battles or fast paced 1v1, on 100s of maps. Zero-K is a strategy, free to play and rts game developed and published by Zero-K Team. Released on April 27th 2018 has received 3,856 reviews of which 3,613 were positive and 243 were negative resulting in an impressive rating of 9.0 out of 10. The game currently holds the #1 spot among the most played free games like Grey Goo.
9.0
3,613
243
89
players
2. AirMech
Similarity 59% AirMech® Strike is a fast paced Action-RTS game that can be played solo, coop, or competitively online. Earn Kudos and Experience in battle and unlock a wide collection of AirMechs and Units while you practice the perfect strategy to emerge victorious! AirMech is a free to play, strategy and multiplayer game developed and published by Carbon Games. Released on March 30th 2018 has received 10,654 reviews of which 8,960 were positive and 1,694 were negative resulting in a rating of 8.2 out of 10. The game currently holds the #2 spot among the most played free games like Grey Goo.
8.2
8,960
1,694
47
players
3. Warzone 2100
Similarity 54% In the late 21st century, the world's civilizations are wiped out by a series of nuclear strikes, seemingly caused by a massive malfunction of the new NASDA (North American Strategic Defense Agency) strategic defense system. Warzone 2100 is a strategy, free to play and rts game developed by Pumpkin Studios, Underdone Gaming and Warzone 2100 Project and published by Underdone Gaming. Released on February 18th 2020 has received 1,479 reviews of which 1,336 were positive and 143 were negative resulting in a rating of 8.6 out of 10. The game currently holds the #3 spot among the most played free games like Grey Goo.
8.6
1,336
143
35
players
4. Planet S
Similarity 55% Planet S is a real-time strategy game where your goal is to colonize multiple planets in a solar system to advance your civilization, build a city and supply it to grow your faction. Planet S is a strategy, city builder and multiplayer game developed and published by Glimmerlight Games. Released on October 28th 2023 has received 2,565 reviews of which 2,352 were positive and 213 were negative resulting in a rating of 8.8 out of 10. The game currently holds the #4 spot among the most played free games like Grey Goo.
8.8
2,352
213
17
players
5. Space Commander: War and Trade
Similarity 52% Fight, explore the stars, trade, and lead your fleet across the galaxySpace Commander: War and Trade is an ultimate single player space-sim featuring spectacular graphics, intuitive combat and deep mechanics. Space Commander: War and Trade is a action, rpg and base-building game developed and published by Home Net Games. Released on November 04th 2020 has received 649 reviews of which 438 were positive and 211 were negative resulting in a rating of 6.5 out of 10. The game currently holds the #5 spot among the most played free games like Grey Goo.
6.5
438
211
12
players
6. Galcon 2: Galactic Conquest
Similarity 52% Galcon 2 is a demolition derby in space! Send swarms of ships from planet to planet to conquer the galaxy in this fast paced multiplayer strategy game! Galcon 2: Galactic Conquest is a free to play, strategy and indie game developed and published by Hassey Enterprises and Inc.. Released on December 05th 2014 has received 858 reviews of which 718 were positive and 140 were negative resulting in a rating of 7.9 out of 10. The game currently holds the #6 spot among the most played free games like Grey Goo.
7.9
718
140
7
players
7. Istrolid
Similarity 53% In Istrolid you design your own unique spaceships from a large number of parts to fit your strategy and play style. With no set units or factions you are free to create a fleet where each ship has its own balanced strengths and weaknesses, from basic fighters and bombers to hulking battleships and speedy destroyers. Istrolid is a free to play, building and strategy game developed and published by treeform. Released on May 06th 2016 has received 2,658 reviews of which 2,322 were positive and 336 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #7 spot among the most played free games like Grey Goo.
8.4
2,322
336
4
players