Top-Rated Free Moddable Games on Steam

39 free Moddable games with 500+ reviews and a 70%+ positive rating, newest first.

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My Singing Monsters Karaoke - Players say: Guide a My Singing Monsters character through mouse-controlled note charts, earn a judges’ rating, and import fan-made song charts. Players like: Funny Monster Animations · Custom Song Imports · Cute Character Art ·
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Choose your favorite Monster and hop on the karaoke stage for the performance of a lifetime! Hit the notes, conduct the chaos, and watch your favorite Monster performers squish, stretch, and contort through every song. Whether you’re pitch-perfect or off key, every karaoke concert will be memorable!

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Aug 19, 2026
77% 👍
of 738
SCP – Containment Breach - Players say: As a Class-D subject in a breached SCP facility, scavenge access items, evade anomalies, and manage blinking to escape. Players like: Unsettling Atmosphere · Blinking Under Threat · Community Bug Fixes ·
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A procedural first-person horror adventure. You are on your own after something goes terribly wrong in this top-secret containment facility. Collect items to aid in your escape and try to uncover the truth, as horror lurks behind every door. Can you make it out alive?

Delivery & Beyond - Players say: Play a hyena employee who raids homes for scrap, turns it into delivery orders, and races to complete the job with friends. Players like: Fun With Friends · Scrap-to-Delivery Loop · Chaotic Comedy ·
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No packages? No problem! Break in. Scrap everything. Deliver... A chaotic online co-op game for up to 5 players (or 15 if you really want to)!

FALLSTRUKTUR - Players say: Navigate a surreal megastructure in first person, managing slippery momentum and risky jumps as you descend without a fatal fall. Players like: Dreamlike Atmosphere · Momentum-Based Movement · Multiple Descent Routes ·
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It takes a while to go back to sleep, but inevitably, you return. To dream of the Fallstruktur.

TWA - First Haul - Players say: Take a first trucking job across Australia's outback, hauling cargo, handling your rig on foot, and facing storms and rough roads. Players like: Hands-On Truck Tasks · Roadside Events · Outback Atmosphere ·
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Become a truckie in the heart of Australia! Brave the scorching desert, conquer a sandstorm and support the local industry by delivering vital cargo across the continent’s treacherous terrain.

Rally Mechanic Simulator: Light Edition - Players say: Play as a rally-team mechanic, repairing and tuning a damaged car under time pressure before rallies and test-track runs. Players like: Detailed Car Repairs · Rally Mechanic Role · Realistic Car Detail ·
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Step into the world of rally car mechanics with Rally Mechanic Simulator: Prologue, a free introduction to the full game. Take your first steps as a rally mechanic, facing the challenges of fixing and tuning a rally car.

The Powder Toy - Players say: Experiment with particles in a 2D physics sandbox, mixing materials, building reactors and circuits, or triggering chain reactions. Players like: Particle Experiments · Physics Interactions · Reactors and Circuits ·
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The Powder Toy is a classic physics sandbox game, which simulates air pressure and velocity, heat, gravity and a countless number of interactions between different substances

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Jun 14, 2024
98% 👍
of 3.0k
Pyroworks - Players say: Set up mortars, wire firing systems, and launch real-brand fireworks to choreograph displays or make multiplayer mayhem. Players like: Firework Variety · Creative Show Design · Realistic Sound Effects ·
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Pyroworks is a free-to-play online multiplayer game containing fireworks from real-life companies from all over the globe. You can choose to make your own show, cause destruction and chaos or simulate new years. Don't miss out on playing with your friends - the most fun part.

Operation: Harsh Doorstop - Players say: A tactical military FPS where you capture objectives with a squad, fight bots or players, and expand battles through community mods. Players like: Community-Created Mods · Tactical Team Battles · Offline Bot Matches ·
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Operation: Harsh Doorstop is the ultimate, free to play, tactical shooter sandbox. Play singleplayer, multiplayer, or co-op modes and explore thousands of community-created maps, weapons, and vehicles via the Steam Workshop. Created by developers of the cancelled Project Reality 2 project.

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Feb 15, 2023
78% 👍
of 20k
Truck World: Driving School - Players say: Learn to handle a truck in the Outback through graded lessons, tricky maneuvers, varied cargo, and hands-on cab practice. Players like: Fond Memories ·
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Learn the basics of truck driving! Truck World: Driving School is a free standalone truck simulator with challenges, grades, and much more.

MuseSwipr - Players say: Match falling left- and right-side beats by swiping your cursor across two lanes, then build and share custom charts. Players like: Novel Mouse Controls · Custom Workshop Charts · High Skill Ceiling ·
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A rhythm game where you swipe between two lanes to the beat. Form your own flow and unleash your greatest swiping performance.

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Dec 20, 2022
86% 👍
of 691
Rock Life: The Rock Simulator - Players say: Become a rock in nature, watch the world pass, switch rock forms, try mini-games, or spend time with friends in co-op. Players like: Relaxing Nature Atmosphere · Absurd Rock Premise · Unexpected Mini-Games ·
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Built from the ground up, Rock Life is the next generation of immersion and simulations. Live, do, and experience what it is like to truly become one with nature... as a rock!

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Jul 20, 2022
95% 👍
of 2.5k
Kemono Friends Cellien May Cry - Players say: As Serval, battle Celliens across Japari Park, rescue animal Friends, and summon them to fight alongside you in 3D action combat. Players like: Fun Action Combat · Cute Cartoon Visuals · Familiar Friends Cast ·
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A fanfic game of "Kemono Friends". Hack and slash action RPG. You can summon Friends and fight together. There are more than 30 Friends. There are more than 60 types of enemies. There are 4 levels of difficulty, so even people who are not good at action games can enjoy it.

Tanks: The Crusades - Players say: Pilot a blue tank through enemy-filled levels, using specialized abilities in solo or multiplayer battles and custom stages. Players like: Wii Tanks Resemblance · Level Editor · Custom Campaigns ·
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A top-down shooter with tanks that have various assorted abilities, with support for multiplayer and a level editor.

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Jun 24, 2021
95% 👍
of 734
Infinitode 2 - Infinite Tower Defense - Players say: Place specialized towers against enemy waves, mine resources during battles, and research upgrades across a sprawling defense campaign. Players like: Strategic Tower Placement · Deep Research Tree · Tower Variety ·
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Infinitode 2 - a strategy in the Tower Defense genre, in which the player will have to build towers to protect his base from endless waves of enemies. The game features huge maps, lots of towers, resource miners, upgrade tree and map editor.

OpenTTD - Players say: Build a transport company on generated maps, routing trains, trucks, ships, and aircraft to move passengers and cargo for profit. Players like: Transport Network Building · Absorbing Long Sessions · Train Route Design ·
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OpenTTD is a business simulation game in which players earn money by transporting passengers and cargo via road, rail, water, and air. It is an open-source remake and expansion of the 1995 Chris Sawyer video game Transport Tycoon Deluxe.

Krunker - Players say: Fight through fast multiplayer FPS matches, using advanced movement, custom modes, and player-made maps to shape each session. Players like: Fast Movement · Quick Matches · Custom Maps and Modes ·
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An easy to get into fully moddable First Person Shooter with advanced movement mechanics. Fully Customizable with Mods, Custom Maps and Thousands of Items to Unlock.

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Feb 1, 2021
79% 👍
of 26k
DDNet - Players say: Race through demanding 2D obstacle maps, mastering jumps and a grappling hook alone or with teammates who can rescue you. Players like: Satisfying Skill Mastery · Co-op Teamwork · Community Map Variety ·
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Want to play the hardest cooperative 2D platformer ever? Want to finish no map ever? Want to be in pain for hours and cry, getting nothing in return? Come play DDNet with a large community of other sufferers!

Red Eclipse - Players say: Fight fast arena matches with seven weapons, parkour movement, bots, and tools for building maps together. Players like: Fast Arena Combat · Parkour Movement · Offline Bot Matches ·
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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.

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Dec 19, 2019
87% 👍
of 864
Codename CURE - Players say: A class-based FPS where up to five operatives fight through infected zones, plant explosives and escape or endure zombie waves. Players like: Co-op With Friends · Free Zombie Co-op · Distinct Class Roles ·
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Codename CURE is a first person, co-operative zombie game with support for up to five players, providing dynamic, fast-paced zombie fragging with both objective, and survival-based missions.

Alien Swarm: Reactive Drop - Players say: Lead marines through alien-infested facilities, combining top-down shooting, class tactics and mission objectives. Players like: Co-op With Friends · Team Class Roles · Workshop Content ·
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Co-operative top-down shooter game available for free. An epic bug hunt featuring a unique blend of co-op play and squad-level tactics.

Simutrans - Players say: Build a transport company by routing trains, roads, ships, and planes to move people, mail, and goods across a growing world. Players like: Deep Network Planning · Destination-Based Logistics · Rewarding Optimization ·
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Simutrans is a freeware and open-source transportation simulator. Your goal is to establish a successful transport company. Transport passengers, mail and goods by rail, road, ship, and even air. Interconnect districts, cities, public buildings, industries and tourist attractions.

The Political Machine 2016 - Players say: Campaign for the 2016 U.S. presidency by taking positions on voter issues, working states, buying ads, and managing unpredictable events. Players like: Multiplayer Matches · Strategic Complexity · Candidate Customization ·
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Run for President of the United States as one of dozens of past or present presidential candidates or create your own ideal candidate. Give speeches, go on talk shows, hire unsavory operatives, and do whatever it takes to win on election day.

Sven Co-op - Players say: Team up in Half-Life-inspired missions to fight computer-controlled enemies, solve puzzles, and reach objectives across maps. Players like: Co-op Campaigns · Playing With Friends · Custom Map Variety ·
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Sven Co-op is a co-operative game originally based around Valve Software's Half-Life. In this game players must work together against computer controlled enemies and solve puzzles as a team.

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Jan 22, 2016
94% 👍
of 32k
Order of Battle: World War II - Players say: Command WWII forces across hex-grid campaigns, using terrain, unit strengths, commanders, and supply lines in turn-based battles. Players like: Supply-Line Tactics · Tactical Battle Depth · Campaign Variety ·
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Order of Battle: World War II is a breath of fresh air for all strategy fans. It is a game that takes wargaming to a new level by upgrading every single game element and rebooting the genre for a new generation of players.

DEAD OR ALIVE 5 Last Round: Core Fighters - Players say: Pick a martial artist and battle in fast 3D fights built around counters, combos, and interactive arenas. Players like: Fast Counter Combat · Interactive Fight Stages · Distinct Fighter Styles ·
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The free version of the final word in fighting entertainment - DEAD OR ALIVE 5 Last Round!

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Mar 30, 2015
70% 👍
of 10k
Boring Man - Online Tactical Stickman Combat - Players say: Fight rival stick figures in a 2D shooter, combining acrobatic movement, a varied arsenal, and online or bot matches. Players like: Chaotic 2D Combat · Weapon Variety · Nostalgic Friend Sessions ·
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Battle other 2D stickfigures online while jumping around like a lunatic and getting blown up into smithereens. With over 70 weapons, Boring Man is the most chaotic and hilarious 2D online shooter on the internet.

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Feb 20, 2015
88% 👍
of 5.4k
Galcon 2: Galactic Conquest - Players say: Send fleets between planets in fast real-time battles, expanding your territory against rivals in solo and multiplayer matches. Players like: Fast, Short Matches · Simple Tactical Decisions · Competitive Multiplayer ·
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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!

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Dec 5, 2014
83% 👍
of 867
X-Plane 10 Global - 64 Bit - Players say: Pilot 30 aircraft in a flight simulator, handling varied conditions, air traffic control, online flights, and generated scenery. Players like: Smooth Replays · Enjoyable Flying ·
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X-Plane 10 brings numerous improvements and enhancements for PC, Mac and Linux virtual pilots, unleashing the power of modern systems with its 64 bit processing and multi-core support.

Toribash - Players say: Direct a ragdoll fighter in turn-based bouts by setting each joint’s movement, then watch physics resolve your self-designed attacks. Players like: Joint-Control Combat · Creative Move-Making · Physics-Driven Fights ·
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Toribash is an innovative free-to-play online turn-based fighting game where you’re able to design your own moves. Complete control over character's body, hundreds of game mods and bloody mess with full body dismemberment - you've never been able to annihilate your enemies like that before!

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May 16, 2014
88% 👍
of 16k
Just Cause 2: Multiplayer Mod - Players say: A multiplayer mod for Just Cause 2 turns Panau into a shared sandbox for stunts, races, fights, and roleplay. Players like: Chaotic Multiplayer · Player-Led Activities · Playing With Friends ·
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JC2-MP is a project to bring multiplayer to Just Cause 2 in all of its magnificent glory. Imagine the chaos of normal Just Cause 2, then extending it out to dozens, hundreds, and even thousands of players.

Counter-Strike 2 - Players say: Compete in round-based tactical firefights: buy weapons, plant or defuse the bomb, and coordinate with your team across maps. Players like: Core Gunplay · Clutch Round Wins · Playing With Friends ·
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For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.

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Aug 21, 2012
86% 👍
of 9.9M
Crusader Kings II - Players say: Lead a medieval dynasty across generations, using marriages, intrigue, laws, and warfare to secure its power and survival. Players like: Emergent Dynasty Stories · Political Intrigue · Generational Strategy ·
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Explore one of the defining periods in world history in an experience crafted by the masters of Grand Strategy.

Alien Swarm - Players say: Lead a four-Marine squad through alien-infested missions, coordinating classes, weapons, and tactics in a top-down co-op shooter. Players like: Cooperative Teamwork · Class-Based Tactics · Intense Alien Fights ·
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Co-operative multiplayer game and complete code base available for free.

SEGA Mega Drive and Genesis Classics - Players say: Play a library of Mega Drive and Genesis games through an emulator-style hub with rewind, save states, challenges, and multiplayer. Players like: Nostalgic Classics · Retro Room Presentation · Rewind And Saves ·
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SEGA’s collection of Mega Drive & Genesis Classics comes to a new generation, now updated with even more features: online multiplayer, achievements, mirror mode, rewind, save states, VR and more! Over 50 classic games in one great package. Get into the classics!

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Jun 1, 2010
79% 👍
of 12k
Unreal Tournament 3 - Players say: Fight in fast sci-fi arena matches, using futuristic weapons, vehicles, and team objectives against human players or bots. Players like: Fast Arena Combat · Weapons and Vehicles · Varied Game Modes ·
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Now includes the free Titan Pack expansion! The Titan Pack gives players a substantial amount of enhanced features and new content, including many original environments, new gametypes, the namesake Titan mutator, powerful deployables and weapons, new characters, and the Stealthbender.

RollerCoaster Tycoon® 3: Platinum - Players say: Build and manage a theme park, design and ride custom coasters, and expand into water attractions and animal safaris. Players like: Nostalgic Replay · Custom Coaster Design · First-Person Rides ·
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Rollercoaster Tycoon 3 Platinum combines the excitement of rollercoasters with the fun of a great strategy simulation. RCT3 Platinum combines the roller coaster theme park fun of the Roller Coaster Tycoon 3 with included expansion packs Soaked! and Wild! Now enjoy more options than ever.

Rome: Total War™ - Collection - Players say: Lead a Roman family through a turn-based campaign, managing an empire and commanding real-time battles across Rome and its invasion-era expansion. Players like: Deep Campaign Strategy · Massive Real-Time Battles · Nostalgic Replay Value ·
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Control and conquer the greatest empire ever known to man.

DOOM 3 - Players say: As a Marine caught in a demonic outbreak on Mars, explore dark UAC corridors and fight back with weapons and a flashlight. Players like: Oppressive Mars Atmosphere · Flashlight-Fight Tension · Horror Sound and Lighting ·
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A massive demonic invasion has overwhelmed the Union Aerospace Corporation's (UAC) Mars Research Facility, leaving only chaos and horror in its wake. As one of only a few survivors, you must fight your way to hell and back against a horde of evil monsters.

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Aug 3, 2007
89% 👍
of 8.4k