The Old Ones’ armies have invaded and it’s up to your and your friends to push them back! Create a team of heroes to defend the Eternia Crystals. Then jump into the action yourself to finish them off! Level up, collect loot, and more on your quest to defeat the Old Ones and save Etheria. Play by yourself or with up to three friends in 4-player online co-op.

Explore a nightmarish environment, scrounge for supplies, and battle the undead in Outbreak -- an online co-op/offline survival horror game. The clock never stops as you attempt to manage an extremely limited inventory with a murderous horde on the hunt. Choose between acquiring additional weapons, healing items, or necessary tools for progression. You have only one life. Make it count!

Pick a direction and set sail across an infinite sea filled with pirates, bosses, buried treasure, quests, and many mysterious places. Discover and upgrade new ships, loot rare armor and weapons, hunt and fish for food and resources, and take on epic adventures all in a procedural world.

<strong>Quest Hunter</strong> is story-driven RPG with treasure hunt, puzzles and humor! Mysterious world, fascinating plot, unimaginable puzzles and insidious enemies are waiting for you!

Build and manage a Maximum Security Prison. As the sun casts it’s early morning rays on a beautiful patch of countryside the clock starts ticking. You’ve got to crack on and build a holding cell to detain the job­ lot of maximum security prisoners that are trundling to your future prison on their yellow bus.

A top down shooter where the maps are covered in darkness and light is your enemy, as 4 players compete in a deathmatch to be the best!

Fight across the ruins of London using carefully refined Free-Form Combat, taking down a terrifying variety of mutated zombies with an expanding special move-set. Created for 1-4 players, for online and offline play, Bloody Zombies is also enhanced with HTC Vive and Oculus Rift.

Design and pilot your own sea-rescue service, in a rich and dramatic physics playground. Steer or fly your custom-designed, block based, programmable vehicles into fierce oceanic storms. Plan and execute thrilling rescues in a variety of challenging crisis scenarios.

Steambirds Alliance is a massively-cooperative bullet-hell shooter! Fly with dozens of friends in an open world full of cruel bosses and endless cascades of deadly bullets. We’ve got a big main world, hundreds of unique enemies, a wide variety of secret missions, and many distinct plane types for you to unlock and master. But fair warning: Steambirds Alliance is a permadeath game - when your plane is shot down, it will be lost to you forever! (However, your pilot will eject and potentially level up if you've fought bravely enough!)

<strong>Warlocks 2: God Slayers</strong> is a humorous pixel-art metroidvania. Challenge the vile gods and dethrone them in this action-packed hack n\' slash experience with wizards and meteor showers.

Hell is at our gates! Fight hordes of demons head-on with a team of Hell Warders, an ancient order of heroes with unique powers and abilities. Push back waves of demons with an arsenal of weapons, powerful hero skills and deployable towers.

Freaky Awesome is a hectic action rogue-lite. You explore a randomly generated old factory, fighting weird monsters and avoiding traps. Toxic wastes will make you mutate, gaining different powers every time. You will need to adapt to your mutations to survive!

Engage in close encounters of primal species through a series of theme-park attractions and witness with your own eyes dinosaurs roaring in the wild.

Experience platforming like never before as you leap through surreal environments and discover all new challenges in the VR game, TO THE TOP!

Black & White Bushido is a 1-4 player stealth-em-up arena brawl. Choose between the light and the shadow in three challenging game modes.Hide with camouflage, throw shurikens and drop smoke bombs to beat your friends locally or online.

It’s a punk rock apocalypse! Team up with your friends to lead embattled punk rock band Charlie Murder in their epic quest to save the world from rival death metalers Gore Quaffer and their legions of evil.

Shoot, slice and surf on zombies by yourself or with friends. Fight overwhelming amounts of zombies and other monsters summoned by an evil wizard (ooOooOOOo spooky) in an early 1900s London.

Karnage Chronicles is an episodic action RPG for the VR platform. Unravel your past, and shape your present, as you vanquish your enemies in this high fantasy epic.

VR Dungeon Knight is in EARLY ACCESS! That means that it's not in a finished state just yet! Although you can help development by purchasing, I would recommend reading the full description first!

～Synopsis
A tragedy began with a girl getting badly burned in school during the early Meiji period. Years later, four high school friends attend an academy in a rural town called Matsudo. As members of the newspaper club, they aim to boost the local area by uploading videos. One day, they explore an abandoned school rumored to have mysterious monsters and past incidents, based on some documents they found. While investigating an old well, they uncover a new truth and gradually approach the incident's truth. However, they don't realize something strange is happening to them too. Can you solve all the mysteries and reveal the truth in this horror escape action game set in an old abandoned school?

～Game Features
"Get Me Out, Please" is a survival horror game where humans try to escape and monsters try to stop them! You can hide, attack, and escape from the abandoned school. You can play alone at your preferred difficulty level with 100 scenarios for replayability or with up to four players and one NPC monster in multiplayer mode. You can switch between three different perspectives, including easy-to-control third-person, immersive first-person, and nostalgic 2D perspectives. Even those who are not good at action games can enjoy it with simple controls.

Geneshift is a top-down shooter bursting with brutal gunplay and insane vehicle action. Unlock mutant skills and outplay friends in tactical online combat. Then play the co-op campaign to discover unlocks, battle zombies, and as always - save the world.

Downward Spiral: Prologue is a unique action adventure multiplayer game powered by innovative, free movement in VR without motion sickness.

Guns of Icarus Alliance is co-op airship combat. Fly solo or with up to 16 friends in challenging objective based scenarios to advance your faction's goals, unlock new gear, and claim the wasteland.

“SHOCK TROOPERS ”, the fan favorite 2D top-down view action shooting game released exclusively on NEOGEO MVS in 1997, returns to the battlefield on Steam!Progress through the battlefield, choosing the best routes and strategy!

Best online-coop Games - Page 149

Dungeon Defenders II

Dungeon Defenders II

Outbreak

Salt

Quest Hunter

Prison Architect

AT SUNDOWN: Shots in the Dark

Bloody Zombies

Stormworks: Build and Rescue

Steambirds Alliance

Warlocks 2: God Slayers

Hell Warders

Freaky Awesome

ARK Park

TO THE TOP

Black & White Bushido

Charlie Murder

GIBZ

Karnage Chronicles

VR Dungeon Knight

Get Me Out, Please

Geneshift

Downward Spiral: Prologue

Guns of Icarus Alliance

SHOCK TROOPERS