Onee Chanbara ORIGIN

(13/10/2020)

• Action
• Singleplayer
• Action-Rpg

To commemorate the 15th anniversary of the sword fighting action game series Onee Chanbara, the events of THE Onee Chanbara and THE Onee Chanbara 2 have been completely remade in full HD. The evolution of this high-speed action game cannot be missed!

Onefold Taxi Simulator

(29/11/2022)

• Open-World

It has a lot of possibilities for all players. Taxi driving is a hobby or a professional level. You can transport for a time or even without a time limit. If you want your own company, just buy some cars, hire employees and become the best taxi entrepreneur in town!

OneForAll

(01/02/2022)

• Open-World
• Shooter
• Survival

This game takes place after an apocalyptic attack and you're one of the last survivors. Your goal is to survive, complete quests, explore the huge wild world, eliminate enemies, level up, and create a safe place for the rest of the survivors.

OneHanded

(28/07/2022)

• Singleplayer
• Platformer
• Shooter
• Indie

Short Retro style sci-fi 3d shooter-platformer with shooting mechanics, where you play as a cyborg shooting and escaping from enemies.

Oneiric

(03/01/2024)

• Adventure
• Casual

Dive into "Oneiric" a charming walking simulator. Play as a 7-year-old boy exploring a nostalgic world of dreams and solve the riddles in a single enchanting night. Short nap, thats 15 minutes game experience focused on visual aspect.

Oneiro

(17/06/2021)

• Action
• Singleplayer
• RPG
• Simulation
• Survival

Utilize skill, creativity, and knowledge to reach the depths of your mental labyrinth. By collecting and stacking items, gears, and weapons, you'll stand a chance against the brutal manifestations of your fears.

Oneiro Man

(30/10/2024)

• Casual
• Singleplayer
• Arcade

Oneiro is an office worker who is forced to stay up all night writing reports to avoid losing his job. The game combines typing mechanics with various mini-games. It’s a 30-40 minute experience with multiple endings depending on your performance.

Oneironaut

(17/09/2019)

• Casual
• Indie

Oneironaut immerses you into the power of imagination through lucid dreaming.

Oneiros

(26/03/2020)

• Action
• Adventure
• Casual
• Singleplayer
• Puzzle
• Indie

Will you be able to break the vicious circle? Can you regain control? Experience the surreal adventure filled with many puzzles and psychedelic visions.

OneJump

(06/03/2020)

• Multi-player
• Platformer
• PvP
• Indie
• Remote-Play

OneJump is a minimalistic highscore based jump game. The challenging factor: you only have one chance to jump. You can play in singleplayer and local multiplayer.

OneKind

(11/09/2024)

• Action
• Adventure
• Casual
• Strategy
• Action-Adventure
• Simulation
• Multi-player
• Survival
• FPS
• Indie

Onekind is a 3-10 player social deduction game set on a farm. Among the peaceful animals, there are evil creatures hiding, causing chaos and messing with the hunter’s mind. Luckily, there’s a hunter, a former wizard, ready to hunt them down. Get ready for some fun!

OneManVurgeR

(14/12/2016)

• Action
• Casual
• VR

Popular mobile VR game OneManVurge now arrives to Steam platform! You can now really sweat playing OneManVurgeR in this new version!

ONENELLEMOO

(06/07/2023)

• Adventure
• Action-Adventure
• RPG

This is an action-adventure game that requires you to use your brain. Save the world with your powers of observation and inspiration!

Oneness

(28/03/2018)

• Casual
• Indie

Oneness is a simple puzzle game with simple but challenge rules, you need use only one line to join all the squares together, when you need to match the condition to achieve award .

Oneons: Prisoners

(30/08/2020)

• Casual
• Board-Game

Oneons is a hard coffee-break roguelite. Explore 12 floors. Uncover dangerous enemies, each with unique abilities. Turn-based combat: fight or use your skills to blast enemies or heal. Balance exploration, energy, and combat. Die. Get stronger. Retry. Turn-based and easy to play, difficult to master

OnePunch

(02/04/2024)

• Action
• Casual
• Arcade
• Indie

Punch or be defeated! There's only one outcome amidst this nonstop action! Match the timing of the never-ending sandbags to conquer!

OneRoom ―Yui Hanasaka Memorial―

(09/01/2025)

• Adventure
• Casual
• Singleplayer

That pure love, that lovey-dovey moment again――A new, immersive animated novel game where you can experience the story of Yui Hanasaka, the main heroine of the popular short anime series OneRoom, from the protagonist’s point of view.Revisit her special moments in this innovative experience!

Ones and Zeroes

(10/07/2018)

• Casual
• Strategy

Ones and Zeros is a puzzle game based on logic circuits. The game features a sandbox mode and endless challenges that allows you to build anything from simple circuits, to a full blown working computer!

OneShift

(09/08/2018)

• Action
• Adventure
• Casual
• Singleplayer
• Indie

OneShift is a puzzle platformer where the player has the ability to freeze/unfreeze time and shift through worlds to collect blue cubes. But only one world can be active at a time. Later in the game, a world rotating mechanic is unveiled, which makes everything more complex!

OneShot

(07/12/2016)

• Adventure
• Casual
• Singleplayer
• Puzzle
• RPG
• Simulation
• Indie

OneShot is a surreal top down Puzzle/Adventure game with unique gameplay capabilities. You are to guide a child through a mysterious world on a mission to restore its long-dead sun. The world knows you exist.

OneShot: World Machine Edition

(29/09/2024)

• Adventure
• Casual
• Singleplayer
• Puzzle
• Indie

A completely self-contained portable version of one of the highest user-rated games. Built on an entirely new engine with new UI, support for Steam Deck, & more. Features world-bending puzzles, intriguing denizens, surreal environments, and a captivating story about the truth of the game's reality.

OneShotRogue

(19/06/2022)

• Strategy
• Card-Game

Deck-building roguelike Use cards to reduce the enemy's HP to just 0. This is an easy battle because all battles are over in one turn.

Oneteam Soccer

(22/07/2020)

• Action
• Multi-player
• Sports

Let's play ONETEAM SOCCER. All players move together since they're "ONETEAM".

Ongaku

(27/05/2015)

“Pop the bubbles to the music, to paint the perfect picture!” Ongaku is a uniquely addictive side-scrolling 2D rhythm action game with the infusion of original music and stylised artwork.

Oni Hunters

(31/03/2025)

• Adventure
• Strategy
• Simulation

Journey through Gironia's lands, where monsters roam and secrets await. Battle, fuse creatures, and decide your fate in the grand Monster Jubilee. Ready for the adventure?

ONI : Road to be the Mightiest Oni

(07/03/2023)

• Adventure
• RPG
• Simulation
• Open-World
• Platformer
• Sports
• Indie

Break your enemies' souls to reclaim your pride. On Kisejima, demon warrior Kuuta and his partner Kazemaru challenge these souls to a trial. All in order to defeat Momotaro, who is both human and evil monster… A tale of sky and wind as they embark upon an island quest.

Oni Station

(01/10/2023)

• Adventure
• Singleplayer
• Arcade
• FPS
• Indie

Oni Station is a horror game with roguelike and arcade elements where you pilot a train to outrun the creature chasing you. Carefully plan which stations to stop, search for resources and, above all, how far can you survive?

ONIBITO KIKI

(28/11/2024)

• Action

Experience ONIBITO KIKI’s first game adaptation in 90s-style 2D action! Play as KIKI, leader of the ONIBITO clan, using special abilities to conquer tough missions. Enjoy retro pixel art combined with modern gameplay—join KIKI on an epic adventure!

OniBushi VR

(12/04/2018)

• Action
• Early-Access
• Indie

Samurai Action Slasher for VR Defend your Castle from invaders using your fencing, ninja, archery skill.

Onigiri

(27/03/2019)

• MMO
• Action
• Adventure
• RPG
• Simulation
• Action-Rpg
• Massive-Multiplayer

Onigiri is an MMO Action RPG with a fast weapon changing battle system. Join a party of other players or travel with 8 NPC companions on your journey. With simple controls, you can dive into the thrilling world of Onigiri. Switch between weapons to battle through the Youkai.

Onigo Hunter

(24/05/2023)

• Adventure
• Strategy
• RPG
• Simulation

Embark on a quest to find the missing King and become the ultimate hunter in this turn-based RPG. Set traps to capture monsters, transform them into equipment and items, and complete challenges!

Onii-Chan

(26/03/2018)

No description available.

Onii-chan Asobo

(26/09/2019)

"Let's play Onii-chan" is a Slice of Life/Eroge Kinetic Novel about a developer of AO-rated games and his younger sister, who wants to become a developer too and intends to learn by doing things.

Oniken: Unstoppable Edition

(04/02/2014)

• Action
• Singleplayer
• Platformer
• Indie

When a global war nearly decimated humankind, an evil military organization called Oniken takes advantage of the situation to dominate and oppress the few remaining survivors. Even though any resistance to this organization seemed hopeless, a small rebel movement organizes strikes against Oniken.

Onikira - Demon Killer

(26/08/2015)

• Action
• Adventure
• Platformer
• Beat-em-up
• Indie

Onikira is a 2D side scrolling beat ‘em up set in a fantasy feudal Japan where the player takes on the role of a samurai fighting to prevent the forces of the Japanese underworld from breaking through into the world of the living.

ONIKO KORORIN GAME

(14/05/2024)

• Action
• Casual
• Puzzle

Characters from Onigiri High School are now available as cute puzzles! Supported by UUUM, the song in the opening movie is actually NMB48! Roll the rice balls, stack them high, make them big, and go through various gimmicks to avoid red spots (!?) Get the "Legendary Salmon"!

Onimusha 2: Samurai's Destiny

(21/05/2025)

• Action
• Action-Adventure
• Survival
• Action-Rpg

Reclaim your destiny. Onimusha 2: Samurai's Destiny returns with higher resolution graphics and modernised controls to perform issen critical counter attacks and intense swordplay. Experience this dramatic revenge story set in Feudal Japan.

Onimusha: Way of the Sword

(01/01/2026)

• Action
• Action-Adventure
• Action-Rpg

An all-new entry in the Onimusha series! Coming in 2026.

ONINAKI

(21/08/2019)

• Action
• RPG
• Simulation
• Action-Rpg

The all-new Action-RPG, ONINAKI tells the story of one Watcher on a journey to protect Life, after Death.

Onion Assault

(25/01/2023)

• Action
• Platformer
• Indie

The evil Croquetto Empire is trying to conquer Onionia and it's up to one brave onion farmer, and his mom, to stop the tyrannical invading fascist army! Old-school 2D platfoming from the creator of Gunman Clive and Mechstermination Force.

Onion Force

(01/03/2016)

• Action
• RPG
• Simulation
• Indie

Onion Force is a hybrid Tower Defense/Action Adventure game with 30 levels of butt-puckering mayhem! Use cunning and strategy to strengthen your team chosen from a diverse cast of characters, and hang on to your seat as you try to save the last king from his doom!

Oniria Crimes

(02/12/2020)

• Adventure
• Singleplayer
• Puzzle
• Indie

Oniria Crimes is an interactive noir novel with point & click mechanics. Explore crime scenes in a dreamlike world where objects are the only witnesses. Six cases, a hidden conspiracy. Only you can uncover the truth behind the crimes of Oniria.

Onirike

(28/06/2021)

• Action
• Adventure
• Action-Adventure
• Puzzle
• Open-World
• Platformer
• Indie
• Remote-Play

Onirike is an original 3D adventure, puzzle and platformer video game which takes place in an intricate open world, designed with a non-linear narrative and presented with a peculiar audio-visual aesthetic.

Oniris Basket VR

(16/09/2016)

• Early-Access
• Sports
• VR

Immerse yourself in Oniris Basket VR, a game created for HTC Vive in which you can become a professional All Star player and participate in the famous three point contest. Enjoy playing basketball in the different surrealistic scenarios and game modes. Have fun, train and compete to improve day by day.

Onirism

(25/04/2019)

• Action
• Adventure
• Early-Access
• Shooter
• Indie
• Remote-Play

Onirism will take you in the wonderful world of Crearia for a big adventure! Help Carol put her enemies to sleep, using a variety of toys and abilities to aid you in your quest to find Bunbun in this colorful universe!

Oniwaki Village -Horror game-

(26/08/2024)

• Action
• Singleplayer
• Indie

"Oniwaki Village" is a first-person Japanese horror adventure game set in a Japanese village that has been abandoned due to an incident. Players endure horror as they explore the village and pursue the mystery of the incident....

Onka

(18/07/2023)

• Action
• Action-Adventure
• Indie

Explore the mansion and escape in this 3D horror game. Solve the riddles and escape from the ghosts that roam the mansion!

Online Adult Content Manager

(11/05/2021)

Online Adult Content Manager (OACM) manages and organises your online adult content. Save links to your favourite videos, images or any other content in one convenient location. The best way to organise your online adult content is now on Steam!

Online Retro Tennis

(26/04/2021)

• Casual
• Arcade
• Multi-player
• PvP
• Sports

Computer tennis from the 1970s with online multiplayer

Online Simulator

(12/06/2019)

• Indie

Explore the depths of an unknown computer, finding clues and surprises along the way. Put the pieces together to unravel a psychosexual mystery.