Best Moddable Games on Steam
Unlike generic lists, our strategy game recommendations use a rigorous analysis of Steam user reviews to identify and feature only the best, community-validated moddable games. For those who prefer not to search, lists of the most played, top deals and best free moddable games are available at the bottom of the page.
Filters & Lists
Project Heartbeat
Project Heartbeat is the ultimate cute community-driven rhythm game, featuring music from top artists of the Eurobeat genre made popular by the Initial D anime and manga.
Grand Theft Auto IV: The Complete Edition
Niko Bellic, Johnny Klebitz and Luis Lopez all have one thing in common - they live in the worst city in America. Liberty City worships money and status, and is heaven for those who have them and a living nightmare for those who don't.
CAR TUNE: Project
Car Tune: Project is a dynamic game in which the player takes on the role of a car mechanic. The goal of the game is to tune, modify, and improve the performance of cars. An extensive tuning system and realistic driving physics provide a great experience for automotive enthusiasts.
Void Destroyer 2
Start with nothing... End with everything! All you have is a basic ship, barely fit for combat, with it you'll start your journey and empire. A open world space sandbox, inspired by and expanding the classics.
Red Eclipse
Building on over 15 years of gameplay design, Red Eclipse continues to focus on fast paced, agile, easily accessible first person shooter gameplay. For creators, the full power of the Tesseract engine is at your fingertips in the included realtime multiplayer editor.
Winter Resort Simulator
Are you ready for the winter? Winter Resort simulator lets you operate detailed Doppelmayr cable cars and snow vehicles such as Pistenbully snowcats. Set in a realistic alpine landscape, you are responsible for managing your ski resort and keeping your guests happy.
Transport Fever 2
The classic transport simulation genre has a new gold standard with Transport Fever 2. Discover a whole new world by navigating transport routes through land, water and air. May progress and prosperity find their way!
Sigma Theory: Global Cold War
A Turn-based Strategy game in a futuristic global cold war from the award-winning creators of Out There. Recruit a squad of special agents and run your intel agency to secure the control of the singularity.
Railroad Corporation
Relive the pioneering spirit of the Golden Age of Steam by establishing your own railroad empire across 19th century North America. Bring settlements together, produce and trade goods and develop new technologies to stay ahead of the competition. Want more? RAILROAD CORPORATION 2 Out Now!
Synth Riders
Let the music move you in Synth Riders, a dance-action VR rhythm game with custom song support and a thriving multiplayer community!
AI War 2
The most devious and acclaimed artificial intelligence in strategy gaming is better than ever. A grand strategy/RTS hybrid that reverses many conventions of both genres. Take territory without attracting attention, build your empire with care, and adapt to an ever-evolving galactic battleground.
Erannorth Reborn
Erannorth Reborn is a hardcore sandbox Card Game with heavy emphasis on Deck-Building, Character Customization and Moddability. Create unique characters with distinctive attributes, racial/class skills and perks that affect your cards. Adjust and adapt your deck & equipment on-the-fly.
Fun with Ragdolls: The Game
Become a ragdoll and create your own environments in Sandbox Mode, explore worlds created by others, or just flop around your destructible sets! Fun with Ragdolls: The Game lets you enjoy everything you love about ragdolls!
Siege of Centauri
Defend against thousands of enemies in this explosive tower defense game. Deploy upgradable towers and unleash powerful orbital abilities as you try to protect Earth's first colony world from destruction.
Hellsplit: Arena
VR horror-slasher with physically correct combat system and dynamic battles across arenas in the dark fantasy world.
People Playground
Shoot, stab, burn, poison, tear, vaporise, or crush ragdolls in a large open space.
Kingdom Wars 2: Definitive Edition
An intense real-time strategy game set in a dark fantasy world of Orcs, Elves and Dragons. Kingdom Wars 2 combines the best of Zombie survival and crafting with complex fast-paced city building. Fight massive siege battles that turn beautiful landscapes into gory blood-soaked battlefields.
Steel Division 2
Steel Division 2 is a historically-accurate WW2 real-time strategy game set on the Eastern Front. Features 1:1-scale turn-based army management and real-time tactical battles with thousands of men at your order.
ZUSI 3 - Aerosoft Edition
Zusi 3 Aerosoft Edition is a train simulation for PCs, the professional version of which is also being used in railway companies for engine driver training purposes.
Most played moddable games on Steam
Take a look at the top moddable games that are currently attracting the largest player bases on the Steam platform, as of June 16th 2025.
1. Garry's Mod
Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play. Garry's Mod is a sandbox, moddable and multiplayer game developed by Facepunch Studios and published by Valve. Released on November 29th 2006 has received 1,159,707 reviews of which 1,122,546 were positive and 37,161 were negative resulting in an impressive rating of 9.6 out of 10. The game has hit the top spot as the #1 most played moddable game, thanks to its 19,968 peak concurrent players over the last day.
9.6
1,122,546
37,161
19,968
players
2. Fallout: New Vegas
Welcome to Vegas. New Vegas. Enjoy your stay! Fallout: New Vegas is a open world, rpg and post-apocalyptic game developed by Obsidian Entertainment and published by Bethesda Softworks. Released on October 21st 2010 has received 227,700 reviews of which 218,763 were positive and 8,937 were negative resulting in an impressive rating of 9.5 out of 10. While seeing 4,626 players online at once in the last 24 hours, this game is currently ranked #2 among moddable games based on player count.
9.5
218,763
8,937
4,626
players
3. People Playground
Shoot, stab, burn, poison, tear, vaporise, or crush ragdolls in a large open space. People Playground is a sandbox, gore and physics game developed by mestiez and published by Studio Minus. Released on July 23rd 2019 has received 281,763 reviews of which 277,746 were positive and 4,017 were negative resulting in an impressive rating of 9.8 out of 10. While seeing 4,455 players online at once in the last 24 hours, this game is currently ranked #3 among moddable games based on player count.
9.8
277,746
4,017
4,455
players
4. Car Mechanic Simulator 2021
Work your way to a service empire. Get your hands dirty in a highly realistic simulation game that pays major attention to details. Pay a visit to a new Auction house and buy cars in various conditions. Expand your range of services by investing in a new work space and equipment. Car Mechanic Simulator 2021 is a simulation, automobile sim and realistic game developed by Red Dot Games and published by PlayWay S.A.. Released on August 11th 2021 has received 29,841 reviews of which 28,630 were positive and 1,211 were negative resulting in an impressive rating of 9.4 out of 10. With 1,456 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played moddable games.
9.4
28,630
1,211
1,456
players
5. The Elder Scrolls IV: Oblivion® Game of the Year Edition (2009)
PUBLISHER UPDATE - This is the product page for The Elder Scrolls IV: Oblivion Game of the Year Edition, released in 2009. ---The Elder Scrolls IV: Oblivion® Game of the Year Edition presents one of the best RPGs of all time like never before. Step inside the most richly detailed and vibrant game-world ever created. The Elder Scrolls IV: Oblivion® Game of the Year Edition (2009) is a rpg, open world and fantasy game developed by Bethesda Game Studios and published by Bethesda Softworks. Released on June 16th 2009 has received 50,661 reviews of which 48,307 were positive and 2,354 were negative resulting in an impressive rating of 9.4 out of 10. With 879 concurrent players in the last 24 hours, the game currently holds the #5 spot among the most played moddable games.
9.4
48,307
2,354
879
players
6. Blade and Sorcery
Blade & Sorcery is a built-for-VR medieval fantasy with full physics driven melee, ranged and magic combat. Become a powerful warrior, ranger or sorcerer and devastate your enemies. Blade and Sorcery is a vr, swordplay and moddable game developed and published by WarpFrog. Released on June 17th 2024 has received 57,485 reviews of which 55,566 were positive and 1,919 were negative resulting in an impressive rating of 9.5 out of 10. With 766 concurrent players in the last 24 hours, the game currently holds the #6 spot among the most played moddable games.
9.5
55,566
1,919
766
players
7. Beat Saber
Beat Saber is a VR rhythm game where you slash the beats of adrenaline-pumping music as they fly towards you, surrounded by a futuristic world. Beat Saber is a vr, rhythm and music game developed and published by Beat Games. Released on May 21st 2019 has received 74,612 reviews of which 71,341 were positive and 3,271 were negative resulting in an impressive rating of 9.4 out of 10. With 494 concurrent players in the last 24 hours, the game currently holds the #7 spot among the most played moddable games.
9.4
71,341
3,271
494
players
8. Airport CEO
Build and manage an international airport! Airport CEO is a flight, resource management and moddable game developed and published by Apog Labs. Released on March 04th 2021 has received 7,684 reviews of which 6,433 were positive and 1,251 were negative resulting in a rating of 8.1 out of 10. With 432 concurrent players in the last 24 hours, the game currently holds the #8 spot among the most played moddable games.
8.1
6,433
1,251
432
players
9. Fallout 3: Game of the Year Edition
Prepare for the Future™ With Fallout 3: Game of the Year Edition, experience the most acclaimed game of 2008 like never before. Create a character of your choosing and descend into an awe-inspiring, post-apocalyptic world where every minute is a fight for survival. Fallout 3: Game of the Year Edition is a open world, rpg and post-apocalyptic game developed by Bethesda Game Studios and published by Bethesda Softworks. Released on December 17th 2009 has received 50,593 reviews of which 41,078 were positive and 9,515 were negative resulting in a rating of 8 out of 10. With 354 concurrent players in the last 24 hours, the game currently holds the #9 spot among the most played moddable games.
8
41,078
9,515
354
players
10. DFHack - Dwarf Fortress Modding Engine
Extensions for Dwarf Fortress, including bugfixes, interface improvements, automation agents, design blueprints, modding building blocks, and other tools. DFHack - Dwarf Fortress Modding Engine is a dwarf, simulation and software game developed and published by The DFHack Team. Released on April 13th 2023 has received 742 reviews of which 737 were positive and 5 were negative resulting in an impressive rating of 9.3 out of 10. With 189 concurrent players in the last 24 hours, the game currently holds the #10 spot among the most played moddable games.
9.3
737
5
189
players
Best deals on moddable games on Steam
Discover fantastic savings with the best discounts on a variety of moddable games available on Steam right now, updated on June 16th 2025. Looking for even more deals? Use the search filters to explore a wider range of discounted moddable games.
1. 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. 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 4,772 reviews of which 3,548 were positive and 1,224 were negative resulting in a rating of 7.2 out of 10. Featuring a massive 99% discount, this game currently holds the #1 spot in the best deals for moddable category.
7.2
3,548
1,224
-99%
28.99€
0.56€
2. 112 Operator
Manage emergency services in any city in the world! Take calls and dispatch rescue forces. Handle difficult situations, now depending on the weather, and traffic. Help the citizens through cataclysms and natural disasters, becoming a better emergency number operator every day! 112 Operator is a simulation, realistic and casual game developed by Jutsu Games and published by Games Operators. Released on April 23rd 2020 has received 6,608 reviews of which 5,916 were positive and 692 were negative resulting in a rating of 8.7 out of 10. Thanks to its incredible 97% discount, this game is now the #2 best deal in moddable games.
8.7
5,916
692
-97%
20.99€
0.73€
3. Fallout: New Vegas
Welcome to Vegas. New Vegas. Enjoy your stay! Fallout: New Vegas is a open world, rpg and post-apocalyptic game developed by Obsidian Entertainment and published by Bethesda Softworks. Released on October 21st 2010 has received 227,700 reviews of which 218,763 were positive and 8,937 were negative resulting in an impressive rating of 9.5 out of 10. Thanks to its incredible 92% discount, this game is now the #3 best deal in moddable games.
9.5
218,763
8,937
-92%
9.99€
0.85€
4. KitHack Model Club
Developed by the creator of the original Kerbal Space Program, KitHack Model Club is a physics-based model building sandbox that offers limitless freedom for you and your friends. Design, build, battle, fly (and crash!) your very own RC vehicles, or experiment with over 2,400 ready-made vehicles! KitHack Model Club is a moddable, open world and vehicular combat game developed by Floating Origin Interactive and published by Floating Origin Interactive and Curve Games. Released on August 01st 2024 has received 588 reviews of which 505 were positive and 83 were negative resulting in a rating of 8.1 out of 10. Currently offered at a significant 88% discount, this title has earned the #4 position in the best deals for moddable games.
8.1
505
83
-88%
18.99€
2.42€
5. Airport CEO
Build and manage an international airport! Airport CEO is a flight, resource management and moddable game developed and published by Apog Labs. Released on March 04th 2021 has received 7,684 reviews of which 6,433 were positive and 1,251 were negative resulting in a rating of 8.1 out of 10. Currently offered at a significant 81% discount, this title has earned the #5 position in the best deals for moddable games.
8.1
6,433
1,251
-81%
24.50€
4.80€
6. Airships: Conquer the Skies
Construct mighty steampunk airships and fly them into battle, waging war and conquering the skies! Airships: Conquer the Skies is a vehicular combat, 4x and war game developed and published by David Stark. Released on August 16th 2018 has received 5,947 reviews of which 5,706 were positive and 241 were negative resulting in an impressive rating of 9.3 out of 10. Currently offered at a 50% discount, this title has earned the #6 position in the best deals for moddable games.
9.3
5,706
241
-50%
24.50€
12.25€
7. Rolling Line
Build your own model railway tracks and scenery or explore pre-made layouts, including 1000s of player-made layouts and mods on the Steam Workshop! Play in virtual reality and on PC! Rolling Line is a trains, simulation and sandbox game developed and published by Gaugepunk Games. Released on April 27th 2018 has received 2,187 reviews of which 2,100 were positive and 87 were negative resulting in an impressive rating of 9.2 out of 10. Currently offered at a 44% discount, this title has earned the #7 position in the best deals for moddable games.
9.2
2,100
87
-44%
16.79€
9.41€
8. Citadelum
Citadelum is a city builder set in legendary Ancient Rome. Build your own settlement, gather resources and evolve it into a magnificent city. Explore the world, trade and lead your mighty legions in epic tactical battles. Earn the favor of the Gods or challenge them, if you dare. Citadelum is a moddable, singleplayer and city builder game developed by Abylight Barcelona and published by Abylight Studios. Released on October 17th 2024 has received 720 reviews of which 591 were positive and 129 were negative resulting in a rating of 7.8 out of 10. Currently offered at a 39% discount, this title has earned the #8 position in the best deals for moddable games.
7.8
591
129
-39%
24.99€
15.38€
9. People Playground
Shoot, stab, burn, poison, tear, vaporise, or crush ragdolls in a large open space. People Playground is a sandbox, gore and physics game developed by mestiez and published by Studio Minus. Released on July 23rd 2019 has received 281,763 reviews of which 277,746 were positive and 4,017 were negative resulting in an impressive rating of 9.8 out of 10. Currently offered at a 37% discount, this title has earned the #9 position in the best deals for moddable games.
9.8
277,746
4,017
-37%
8.19€
5.20€
10. Car Mechanic Simulator 2021
Work your way to a service empire. Get your hands dirty in a highly realistic simulation game that pays major attention to details. Pay a visit to a new Auction house and buy cars in various conditions. Expand your range of services by investing in a new work space and equipment. Car Mechanic Simulator 2021 is a simulation, automobile sim and realistic game developed by Red Dot Games and published by PlayWay S.A.. Released on August 11th 2021 has received 29,841 reviews of which 28,630 were positive and 1,211 were negative resulting in an impressive rating of 9.4 out of 10. Currently offered at a 22% discount, this title has earned the #10 position in the best deals for moddable games.
9.4
28,630
1,211
-22%
24.50€
19.21€
Free moddable games on Steam
Check out this fantastic list of free-to-play moddable games you can enjoy on Steam right now, updated on June 16th 2025. Looking for even more free titles? Use the search filters to explore a wider range of free to play moddable games.
1. DFHack - Dwarf Fortress Modding Engine
Extensions for Dwarf Fortress, including bugfixes, interface improvements, automation agents, design blueprints, modding building blocks, and other tools. DFHack - Dwarf Fortress Modding Engine is a dwarf, simulation and software game developed and published by The DFHack Team. Released on April 13th 2023 has received 742 reviews of which 737 were positive and 5 were negative resulting in an impressive rating of 9.3 out of 10. With 189 active players enjoying it for free, this strategy game has reached the #1 spot among the top free moddable games on Steam.
9.3
737
5
189
players