Operation Valderon

(20/09/2019)

• Strategy
• Indie

The people of Valderon need you. The planet is under attack. The emperor has personally selected you to command the defenses. Design your fleet. Create your own path. Save Valderon from an endless wave of enemies.

Operation Valor

(18/10/2023)

• Action
• Casual
• Strategy
• Early-Access
• Shooter
• Indie

Operation Valor is a tactical top-down multiplayer shooter that provides large scale combined-arms combat through base building and teamwork.

Operation Zeta

(12/01/2022)

• Action
• Adventure
• Singleplayer
• Early-Access
• Indie

The great battle codenamed 'Operation Zeta' has been lost. Your ship is in shambles and you have to act quickly to collect all of the parts and repair your ship before the warzone is completely destroyed by the enemies death laser in this space rougelike.

Operator

(04/08/2020)

• Strategy
• Early-Access

Operator is a minimalist elevator management game. Your job is to get passengers to their destination before they stress out. Can you keep up with the demand?

OPERATOR

(31/07/2023)

• Action
• Singleplayer
• Strategy
• Multi-player
• Shooter
• Co-op
• FPS

In OPERATOR, you will play as an elite "Tier 1" operator undergoing dangerous clandestine operations all over the globe. With a strategic, measured, and unforgiving style of gameplay. You are the tactical advantage, Good luck.

Operator Ace's Simple Infinite Survival

(18/03/2024)

• Action
• Arcade
• Early-Access
• Multi-player
• Shooter
• Survival
• Co-op
• FPS
• Remote-Play

O.A.S.I.S is a simple wave-based zombie survival shooter that combines the best elements of classic arcade-style shooters with the atmosphere of an alternate 80's dystopian world. Just relax and have some fun -- either solo or with up to 3 friends.

Operator: Drones

(03/08/2023)

• Open-World
• Shooter

"Operator: Drones" is a drone arcade/simulator that puts you behind the remote terminal of your equipment. Fly high - hit low.

Operator Overload

(27/09/2017)

• Casual
• Indie

Operator Overload is a new puzzle game by indie game creator Benn Powell. Solve your way through over a hundred levels of complex combinatoric conundrums using your logical deduction and problem solving skills, and then create your own using the in-game level editor for others to enjoy.

Operator8

(11/11/2024)

• Action
• Shooter
• Survival
• FPS

An unparalleled alien invasion has overwhelmed the Mining Block Facility on the moon Triton, leaving only death and horror in its wake. You are a mercenary known as Operator8 and you alone have been called in to bring a stop to this fierce attack. Destroy the hive mind at all costs!

Operencia: The Stolen Sun

(30/03/2020)

• Action
• Singleplayer
• Puzzle
• RPG
• Simulation
• Action-Rpg
• VR
• Indie
• Remote-Play

Operencia: The Stolen Sun embraces everything you love about classic first-person dungeon-crawlers, enhancing the old-school turn-based RPG experience with modern sensibilities. Guide a team of memorable characters through a world inspired by Central European mythology.

OPG: Clan Wars

(06/11/2024)

• MMO
• Action
• Early-Access
• Multi-player
• Open-World
• PvP
• Shooter
• Survival
• Co-op
• Massive-Multiplayer
• Remote-Play

Online multiplayer with PVPVE battles. Five game modes. Single-player, team battles, raids, global mode, and bunkers.Arena shooter, open world, quests and crafting resources await you. Join the world of OPG.

OplitisAV

(11/09/2023)

• Action
• Arcade
• Co-op
• Remote-Play

You are a Ferocious Anti-virus Systemic Trucidator (FAST), you are injected in an infected system, and your sole objective is to eradicate all virus life forms.

Opollo

(09/05/2025)

• Action
• Casual
• Indie
• Simulation
• Early Access

Little Minimalist Arcade High Score Chaser with 200+ Vehicle combinations.

OPPAI Academy Big, Bouncy, Booby Babes!

(11/05/2021)

Get reincarnated into a fantasy world, take on the role of the protagonist Takumi, and use your magic to get all the girls! Clear various quests to progress the main story of this gorgeous FANTASY VISUAL NOVEL, and capture the attractive heroines' hearts along the way!

OPPAI Ero App Academy Bigger, Better, Electric Boobaloo!

(23/05/2023)

OPPAI Ero App Academy: Bigger, Better, Electric Boobaloo is a VISUAL NOVEL set in Toaru Academy, an all-girls academy where a bigger bust indicates higher exp! Shimojo Kazuma is the first male student at the school. Will he be able to win the hearts of these buxom beauties?

Oppai Muse

(17/05/2020)

• Remote-Play

Discover your perfect MUSE amidst music beats! This is a simple SUPER CASUAL rhythm game, full of colors and beauties! Collect stars and obtain HEARTS from women! Seek your path to the perfect date! Just remember - Girls will be listening. So don't step on her feet...

Oppai Puzzle L

(20/07/2022)

It's been a busy day. Now, relax your body and come this way. ❤❤Let the elder sister come to comfort your body after a long day❤❤

Oppai Samurai: Knocked up by a No Name Novice

(18/05/2023)

She's got the bounciest boobs and the juiciest ass he's ever seen, and he has the biggest cock she's ever laid eyes on. It's a match made in heaven as the legendary Oppai Samurai gets dicked down and trains to become an even more legendary cock sleeve!

OPPAI Succubus Academy Sucky and Busty, Demonic and Lusty!

(30/07/2024)

OPPAI Succubus Academy is a VISUAL NOVEL set in Faren'ch Deshka Girls' Academy. Its students may excel in bust size, but their ero ranking has the academy on the verge of closure. It's up to Suguru and his Book of Sexy Magic to get all the succubi, teach them his ero ways, and save the day!

Oppaidius Desert Island!

(03/06/2021)

W-w-w-whaaaaat...? I'm on a desert island, alone with Angela... NAKED...? Discover what happens next in this original visual novel!

Oppaidius Tropical Cruise!

(15/01/2020)

During a cruise trip you'll never forget, you meet a beautiful, famous female singer...! Play through this different from usual visual novel, with many bizarre characters and spicy situations!

Oppidum

(22/04/2025)

• Singleplayer
• Co-op
• Cross Platform MP
• Action
• Adventure
• Simulation

Face the challenges of Oppidum, a survival adventure for 1-4 players with a unique story waiting to be unraveled. Build a camp, collect everything a fantastic land can offer, and use it to push forward through the island. A world hanging by a thread needs your help – will you answer the call?

Opportunity: A Sugar Baby Story

(12/02/2023)

An erotic slice-of-life visual novel that is just as wholesome as it is sizzling hot! Jacqueline is a single mother with bills to pay and no time for romance: until an old friend comes to her with a surprising offer.

Ops

(12/08/2024)

• Action
• Casual
• Arcade
• Early-Access
• Indie

Defend Earth from hostile aliens and hungry chupacabras in this modern classic arcade game. Created by a couple of real life VLA Operators!

Optica

(07/11/2018)

• Strategy
• Puzzle

A mind-bending puzzle game of logic and illusion. Embracing simplicity with a geometric design, Optica reveals puzzles in complex and mind-bending ways. From curious shapes and optical illusions to unexpected perspectives, Optica puts spatial thinking to the test through 70+ challenging levels.

Optika

(25/08/2016)

• Adventure
• Casual
• Puzzle
• Indie

Discover the world of light physics: play with lasers, prisms, mirrors, magnets and dozens of other optical devices. Explore the world of Optika with Prof. Opticus and his assistant, Sofia! Research and complete more than one hundred challenging puzzles!

optimal conditions for a sacrifice

(13/02/2025)

mild temperature, dim sunlight, good sleeping schedule, regular fluid intake

Optimum Link

(27/02/2019)

• Casual
• Sandbox
• Indie

Just you and the simulation. No objective.

Opus Castle

(08/11/2021)

• Adventure
• Action-Adventure
• Survival
• FPS

Opus Castle it's a 3D horror, adventure and mysterious game with a narrative based on the real tragic history of the little castle on Apa Street, located in the city of São Paulo, Brazil.

Opus Castle VR

(20/02/2025)

• Action
• Adventure
• Action-Adventure
• VR

Opus Castle VR is a 3D horror, adventure and mystery game with a narrative based on the true and tragic story of the small castle on Apa Street, located in the city of São Paulo, Brazil.

Opus Cortex: A Nonogram Puzzle Story

(06/03/2025)

• Casual
• Indie

Opus Cortex is a nonogram puzzle game with captivating story and a cast of wonderful characters. You are an AI who wakes up in an unknown location, your memory chip damaged and unreadable. In the meantime, the world faces great dangers. Will you find out what happened?

OPUS: Echo of Starsong - Full Bloom Edition

(30/08/2021)

• Adventure
• Singleplayer
• Indie
• Remote-Play

Echo of Starsong is a visual novel style adventure game. Eda, a girl who can hear mysterious sound waves known as starsong, crosses paths with a young man in search of their source. Together, they venture out to the heart of space to unravel an ancient myth.

Opus Ludum

(09/08/2020)

• Casual
• Puzzle
• Board-Game
• Indie

Opus Ludum is a game of wit and skill, where you will have to overcome various challenges that will test your razor-sharp intellect at every step. Opus Ludum will give you a break from daily stress, although it might just break your head.

Opus Magnum

(06/12/2017)

• Singleplayer
• Puzzle
• Building
• Sandbox
• Indie

Opus Magnum is the latest open-ended puzzle game from Zachtronics, the creators of SpaceChem, Infinifactory, and SHENZHEN I/O. Design and build machines that assemble potions, poisons, and more using the alchemical engineer’s most advanced tool: the transmutation engine!

Opus Mortem

(05/07/2018)

• Indie

Play as the Death. Test your reflexes while trying to redirect souls to their respective destinations. Don't worry if it's a bit hard at the beginning, every work gets easier with time and experience!

OPUS: Prism Peak

(01/01/2025)

• Adventure

OPUS: Prism Peak is a narrative-driven adventure game where you play a weary photographer who finds himself caught outside of reality. Using your old camera, you’ll explore an ethereal realm and its ties to the world you left behind, uncover its mysteries, and ultimately find your way home.

OPUS: The Day We Found Earth

(21/04/2016)

• Singleplayer
• Puzzle
• Indie

Dive into the boundless galaxy and embark on an emotional adventure! Help little robot Emeth to fulfill a century-old promise by finding Earth in order to save Mankind—so step into the spaceship, operate a deep space telescope, and find out what’s out there in the unknown.

OR

(07/02/2017)

• Casual
• Indie

Do not underestimate the apparent simplicity of OR because it will amaze you. In the game there will be pitfalls of every kind! The 3D graphics allows you to see the light from above. This opens up a world of possible combinations. With gameplay based around light, OR is a simplified Puzzle/Arcade game.

Oracle

(27/02/2017)

• Adventure
• Casual
• Open-World
• Indie

ORACLE is a single player, open world experience with dozens of locations to explore, great soundtrack and an awesome story ready to be unraveled.

Oracle of Forgotten Testament

(01/03/2018)

• Singleplayer
• Action-Adventure
• Puzzle
• RPG
• Simulation

Oracle of Forgotten Testament is an episodic turn-based RPG Touhou fangame where you play to explore Gensokyo and resolve incidents happening after Marisa found a peculiar book inside Scarlet Devil Mansion's library.

Oracle of Meles

(20/01/2025)

• Action
• Adventure
• Action-Adventure

An ancient prophecy, a chosen one? Shoot your way through an evil castle, collect powerful artifacts, and defeat the evil king. Explore this 2D hand-drawn world full of magic and monsters where nothing is as it seems.

Oracle Trials

(11/02/2021)

• Action
• Casual
• Singleplayer
• Arcade
• Platformer

Oracle Trials is both enjoyable and instructive 2D platformer with cute vector-art visuals combined with nice effects. As a namesake of the famous king Leonidas, gain prestige, restore stolen power of ancient Oracle to foretold the future, learn about ancient mysteries and achieve the highest score!

Oraiah

(30/09/2020)

• Strategy
• Building
• Indie

Become the King of your own nation and restore the ancient empire of Oraiah. Claim the imperial throne by submitting your enemies by strength or by shining so much that it will force the other pretenders to the throne to submit to you. What will you do, my Lord?

Orake Classic

(15/06/2017)

• MMO
• Action
• Adventure
• Strategy
• RPG
• Simulation
• Early-Access
• Multi-player
• Massive-Multiplayer
• Indie

Orake Classic is an old school, 2D tile-based ORPG featuring a variety of skills, monsters, bosses, quests, and extensive lands to explore.

Orakyubu

(14/08/2021)

• Casual
• Singleplayer
• Puzzle

A game about 2D puzzles in 3D space.

Orange Adventure

(03/08/2016)

• Adventure
• Platformer
• Indie

Have fun with this amazing tribute to the best SNES and MEGADRIVE games!

Orange Cast: Prologue

(23/12/2020)

• Action
• Shooter
• Action-Rpg

Prologue to Orange Cast, an atmospheric adventure in a large-scale setting where Soviet and Western science fiction are combined itself. As a humanity’s elite space trooper, you take on a heroic, action-packed adventure throughout the galaxy.

Orange Cast: Sci-Fi Space Action Game

(20/01/2021)

• Action
• Adventure
• Shooter

As humanity’s elite space trooper, you take on a heroic, action-packed adventure throughout the galaxy. Explore planets, protect colonies, and be the first to meet the unknown! Dive into the original story inspired by James S.A. Corey’s The Expanse series...

Orange Moon

(26/09/2017)

• Action
• Simulation
• Early-Access
• Platformer
• Indie

Search for new life forms as you try to survive on a mysterious hostile world in the surreal 2D action-platformer Orange Moon.

Orange Roulette

(06/10/2024)

• Action
• Singleplayer
• Strategy
• Survival

Trapped in a prison hell, a desperate orange will play a deadly game in the hopes of getting shipped to safer markets. Can he survive what his captors have freshly squeezed for him?