OpenGloves

(20/05/2021)

OpenGloves is an open source, OpenVR Driver that allows for use of DIY Virtual Reality Hardware in SteamVR games.

Opening Night at the Großen Schauspielhaus - Berlin 1927

(03/05/2021)

• Casual
• VR

Visit Berlin 1927 and explore the VR-reconstruction of the famous theatre. Three storytellers, Walter, Fritzi and Otto, invite you to share their anticipation of the opening night – behind the scenes and on stage. Our digital theatre opens new perspectives; cultural heritage comes alive virtually.

Opening Up

(03/06/2020)

• Adventure

A short story about explaining the unexplainable.

OpenTTD

(31/03/2021)

• Singleplayer
• Multi-player
• Building
• Co-op
• Sandbox

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.

OpenVR Benchmark

(19/12/2019)

Benchmark your VR setup - OpenVR Benchmark is the first benchmark tool for reproducibly testing your real VR performance, rendering inside of your VR headset. See if your hardware performs correctly! VR headset required.

Operação Prato

(19/06/2025)

• Action
• Adventure
• Casual
• Action-Adventure
• Early-Access
• FPS

'Operação Prato' is a game based on one of Brazil's greatest ufological mysteries. Step into the shoes of Mario, the reporter who will risk his own life to expose the entire truth about the events that terrified the residents of the Colares region.

Operation Abyss: New Tokyo Legacy

(26/03/2017)

• RPG
• Simulation

When reports of kidnappings and strange incidents begin to break out across Tokyo, Hinowa Academy's very own Xth Squad is dispatched to investigate and neutralize the imminent danger. Loyalties will be questioned and secrets will be exposed as they desperately search for the truth!

Operation Airsoft Beta

(29/07/2021)

• Action
• Casual
• Strategy
• Multi-player
• PvP
• Shooter
• FPS
• Sports
• E-Sports

Operation Airsoft is an online first-person shooter based on the popular sport of airsoft. Choose from a library of real-life field layouts, including SpeedQB, Speedsoft, and Milsim game styles. (Currently Outdated)

Operation Armstrong

(17/05/2021)

• Strategy
• Multi-player
• PvP
• Co-op
• Remote-Play

Your infiltration team must stop an army of lunar-bots from crashing the moon into our Earth! The field operative, wielding the VR headset, must sneak through each enemy outpost while their team of hackers will assist using their smartphones! Strap in for some Asymmetric-VR-Stealth-Party gameplay!

Operation Athena

(02/12/2024)

• Action
• Singleplayer
• Early-Access
• Multi-player
• Shooter
• FPS

Operation Athena is a tactical first person shooter that takes inspiration from classic tactical shooters with updated modern mechanics. Take part as an operator of Athena Team solo or with up to 4 players against a global terrorist threat.

Operation Babel: New Tokyo Legacy

(15/05/2017)

• RPG
• Simulation

When a mysterious object—dubbed ‘the Embryo’—appears in the sky, the CPA and the Xth Squad are mobilized to face the new threat. Customize your characters with the innovative 'Sub-Blood' system, form your perfect team, and venture into deadly labyrinths to challenge the invaders!

Operation Blackfox

(12/11/2024)

• Adventure

Operation Blackfox is an interactive graphic novel. At various points in the story, you will be asked to make a choice, these choices will take you down different paths in the story. Your objective is to rescue as many characters as possible. The game features 3 possible story endings.

Operation Breakout

(27/10/2016)

• Action
• Adventure
• FPS
• Massive-Multiplayer
• Remote-Play

A fantastic FPS to play together with your friends or alone.Go into the savage world of Operation Breakout and get yourself to the top!A great game without Pay2Win!

Operation: Cheek Clapper

(19/09/2019)

• Action
• Indie

Storm the base and clap alien cheeks in this fast-paced action game. Instant, quick, no fuss, alien fun!

Operation Covid-19

(11/06/2020)

• Arcade

An endless first person shooter in which you CAN destroy viruses with TP rolls. Earn points, level up, get upgrades and shoot the new normal in the face.

Operation Crustacean

(01/01/2025)

• Action
• Adventure
• Action-Adventure

Ride a large shrimp to explore a perilous island in this surreal hardcore 3D platformer. With permadeath, rare powerups, and challenging bosses, you will have to master the unique physics-based controls and embrace the dark humour to overcome the impossible.

Operation Deep Magic: Cryptanalysis

(20/01/2020)

• Puzzle
• Early-Access

Reconnaissance operatives infiltrated a corporate building and extracted electronics and files encrypted with 56-bit DES. Items were handed over to you, the cryptanalyst. Your mission is to decrypt the files.

Operation Defensive!

(31/05/2022)

• Casual
• Singleplayer
• Indie
• Remote-Play

Operation Defensive is a tower defense game but instead of monsters following a track they follow a player. place down towers to fight those monsters and try to get to the highest wave you can! have fun!

Operation DogFight

(12/10/2021)

• Action
• Casual
• Action-Adventure
• Arcade
• PvP
• Indie
• Remote-Play

Operation DogFight is a free local multiplayer airplane combat game where all the pilots are Dogs. Make use of dog-themed weapons to take down your friends across multiple maps.

Operation : ERONTA

(18/02/2023)

• Action
• Casual
• Action-Adventure
• Indie

Conflict and action are waiting for you in this "FPS and Single Player" game. You'll get into harsh conflicts against enemies with your weapons and also utilize the enviroments in these conflicts. You'll have another experience each level and be connected to the game more and more.

Operation Excision

(01/01/2025)

• Action

Operation Excision is a retro styled first person shooter with visuals inspired by 1980’s vector graphic arcade games, and a setting and story influenced by 1970’s and 1980’s science-fiction movies, books, and comics.

Operation F.A.T.E.

(27/02/2023)

• Adventure
• Shooter

The year is 2120 and things have gone horribly wrong. What was once Earth is now a sprawling wasteland of sentient machines and deadly AI. Is there any hope of saving the planet?

Operation Flashpoint: Dragon Rising

(06/10/2009)

• Action
• Adventure
• Singleplayer
• Strategy
• Multi-player
• Open-World
• Shooter
• Co-op
• FPS

Operation Flashpoint: Dragon Rising is a game about a fictitious conflict on one of the Sakhalin islands.

Operation Food to Gold

(27/03/2024)

Operation Food to Gold is an idle game, rhythm game and dating sim. Feed the blob to gain gold, gamble the gold to get gifts and give them to 15 different waifus. Unlock various lewd 18+ costumes for them. Play some custom made Drum and Bass tracks in the Rhythm mode with Lucy and Lilly.

Operation: Forge the Deep

(27/11/2022)

• Casual
• Puzzle
• PvP
• Co-op

Solve real materials science problems, contribute to science, and survive a new ice age in a puzzle adventure that combines engineering problems with a unique puzzle that will challenge how you look at the world around you.

Operation Hardcore

(27/12/2016)

• Action
• Adventure
• Action-Adventure
• Platformer
• Shooter
• Remote-Play

Operation Hardcore is an action-packed 2D side-scrolling shooter inspired by classic twitchy action games of yesteryear, but with modern touches and conveniences.

Operation: Harsh Doorstop

(14/02/2023)

• Action
• Singleplayer
• Strategy
• Early-Access
• Shooter
• FPS
• Indie

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 ex-developers of Squad, Red Orchestra, and Insurgency.

Operation: Harsh Doorstop "Closed Beta"

(28/03/2023)

• Action
• Singleplayer
• Early-Access
• Multi-player
• PvP
• Shooter
• Co-op
• FPS

This is the Operation: Harsh Doorstop "Closed Beta" which is available exclusively to players who have financially supported the development of Operation: Harsh Doorstop. This version of the game is updated daily, and includes features and content that have not yet been released to the public.

Operation: Harsh Doorstop Dedicated Server

(14/02/2023)

No description available.

Operation HuntingHawk : Breakthrough

(02/11/2024)

• Action
• Adventure
• Shooter
• FPS
• Indie

Operation HuntingHawk : Breakthrough is a fast-paced single player first person shooter game that offers 9 highly playable levels. Players will face dangerous and challenging enemies and engage in intense battles with them.

Operation KREEP

(09/06/2016)

• Action
• Remote-Play

An extraterrestrial organism threatens deep space exploration missions! Only trained personnel working as a team can eliminate these infestations. But, the corporation financing the space endeavor has a private mail for you: Cold hard cash for the alien alive! Which side will you choose?

Operation “Kyiv”

(22/02/2024)

• Action
• Shooter
• FPS
• Indie

Operation "Kyiv"": Immerse yourself in intense FPS battles on the territory of Irpin, Bucha, Gostomel, Сhernihiv and the M0-6 highway. Authentic combat, strategic firefights that determine the fate of Kiev. Are you ready to fight?"

Operation Lone Wolf

(30/09/2018)

• Action
• Early-Access
• FPS
• Indie

Operation Lone Wolf is an indie shooter, set in the Second World War. Play the first single player mission, Dogfight, PvE, or multiplayer with a lot of different weapons, fluid movement, smooth and responsive gunplay, killstreaks, perks and much more.

Operation Marakudja

(10/11/2024)

• Action
• Arcade
• Multi-player
• PvP
• Shooter
• FPS
• Super-Hero

Mmm... It's Marakudjaaaa! Operation Marakudja is a dynamic multiplayer first-person shooter. What can you do for the divine fruits of Marakudja? Choose your hero and fight against many players around the world to collect the precious fruits and win!

Operation: Matriarchy

(28/01/2016)

• Action
• FPS

Operation: Matriarchy is a science fiction first-person shooter. In the 24th century mankind has formed itself into the Federation of Earth, and has colonized several other planets. However, around 2350 a mysterious virus ravages the colony planet of Velia, targeting only the females within the population.

Operation: New Earth

(13/12/2016)

• MMO
• Strategy
• Multi-player
• Massive-Multiplayer

Operation: New Earth is an intense sci-fi multiplayer strategy game in which you must command an advanced military facility to defend Earth from a hostile alien invasion. Create an alliance, gather resources, and unlock advanced technology to level up your stronghold!

Operation Night Strikers

(01/01/2025)

• Action
• Arcade
• Shooter
• FPS

Taito's 80's arcade hits hit back! Four milestones of the 80s arcade movement in one action-packed compilation!

Operation Octo

(01/01/2025)

• Action
• Adventure
• Survival

Play as an Octopus scientist fighting off sunken skeletons in this frantic aquatic Tower Defense! Discover sea life turrets from unique biomes: Pistol Shrimp! Navy Seal! Death Ray! Deploy turrets whilst dodging enemy bullets as you venture the seven seas!

Operation of North Kingdom

(12/05/2020)

• Action
• Adventure
• Arcade
• Indie

Operation of North Kingdom is a retro game style game. This is a combination of arcade and 8 bit game. Player has to fight against N.K army and destroy nuclear weapons facility.

Operation Osama Bin Laden

(23/05/2021)

• Singleplayer
• Strategy
• Indie

Upon discovering the location of the Al-Qaeda leader in exile, the US Army sends their best commandos to northern Pakistan. Take control of these commandos, send them behind enemy territories on a hazardous mission, and bring them back alive.

Operation: Polygon Storm

(11/08/2024)

• Action
• Singleplayer
• Strategy
• Sandbox

A fastpaced, military tug-of-war game with minimal micromanagement. Choose and deploy from a mix of specialized military units to overwhelm the enemy. Experiment with a huge variety of unit compositions, synergies, abilities, and upgrades to lead your army to victory!

Operation REMODE

(31/05/2025)

• Action
• Action-Adventure
• Arcade
• Shooter

Welcome to WI Corp, Moddie Operator! Proceed through various levels inside WI Corp's headquarters while defending it from a perilous threat to its secrets using M.O.D.D.I.E, an high tech modular rifle, in this new single player, low-poly style, Twin-Stick Shooter.

Operation Satoshi [Early Version Alpha]

(07/11/2022)

• RPG
• Simulation
• Shooter

This is a game in development. It has been published just to get feedback from community. We are aware there will be defects and will do weekly updates. Feedback can be sent to [email protected]. A shooting RPG game to rescue a kidnapped scientist, Nakamoto Satoshi.

Operation Save the Girl: Code X

(17/02/2024)

• RPG
• Simulation
• Shooter
• FPS
• Indie

An abandoned medieval military base is infested with mutated zombies, and your female boss accidentally enters it while on a mission. Because the zombies are so bad, your female boss is infected by them. You must go and save her. Are you ready?

OPERATION SERPENS

(21/07/2020)

• Action
• Arcade
• Shooter
• Survival
• Co-op
• FPS
• VR

Arcade Shooter | Single user campaign | Co-op multiplayer mode | Fast paced action game

Operation Sexy Sudoku

(04/02/2022)

Solve puzzles to release two dimensional girls from their misty curse. Gather your team of mental gymnasts to aid you on your quest. Bring your friends to tackle unlimited variations of sudoku puzzles.

Operation Sniff

(12/06/2020)

• Action
• Casual
• Arcade
• RPG
• Simulation
• Early-Access
• Multi-player
• PvP
• FPS
• Battle-Royale
• Beat-em-up
• Massive-Multiplayer
• Indie

Operation Sniff game for one or two players. In a single player game you have to play for a dog and complete all the tasks assigned to you. In the mode of confrontation, players have to choose the role of a person or a dog, and fight among themselves, destroying each other or completing all tasks.

Operation Space Force

(20/02/2024)

• Action
• Early-Access
• Multi-player
• PvP
• Shooter
• Co-op
• FPS
• Battle-Royale
• Indie

Join Operation Space Force, a free-to-play team-based shooter that takes place in space. Explore weapon customization and different heroes, your base, fight against enemies, and experience different game modes.

Operation STEEL

(25/01/2022)

• Singleplayer
• Arcade
• Shooter

Operation STEEL is a roguelike shoot-em-up rendered in hand-drawn art. Blow up loads of enemies, destroy huge bosses, find weapons, and upgrade your load-out between levels. Combat the electronic legion across 20+ procedurally generated levels!

Operation : Strike & Secure

(17/11/2024)

• Action-Adventure
• Shooter
• Co-op
• Fighting
• Indie

Operation: Strike & Secure is a tactical and realistic FPS where every shot matters, designed for intense solo or team-based online combat.