Complete Steam Games Database — Every Title, Every Release

Onigiri

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.

Onigiri Shop Simulator

Your own onigiri (rice ball) shop in Japan awaits! Serve perfect rice balls and crispy sides to hungry customers. As a solo operator, you'll manage inventory, perfect your cooking flow, and handle the rush. Can you turn your tiny stand into a beloved town eatery?

Onigo Hunter

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!

Onigotchi

Control a cute and hot 'Oni' in a simple Tamagotchi - style game. Train to become stronger to defeat monsters. Mix and match charms with special effects obtained by losing and being bred by monsters.

Onii-Chan

Onii-chan Asobo

"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

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

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.

Onikura

A frantic and challenging boss rush with options to customize your play style as you progress. Defeat all enemies in your path with attacks, specials, parries, and unique abilities.

Onimod Land

Onimod Land is real-time strategy game. The premise of the game centers around a conflict between inhabiting aboriginals and settlers from space as they both try to colonize a planet. Each race has a unique set of skills (technologies or magic spells). Network game supports up to 8 players.

Onimusha 2: Samurai's Destiny

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: Warlords

Capcom’s riveting samurai adventure returns! This version includes the original game’s intense swordplay and dramatic revenge story, plus improved controls, widescreen display, a new soundtrack, and more. Experience this enhanced version of the best-selling action-adventure classic!

Onimusha: Way of the Sword

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

Onion Assault

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

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!