Games like BRAIN / OUT on Steam
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The Expendabros
The Expendabros have assembled and set their sights on the forces of ruthless arms dealer Conrad Stonebanks in the forests of Eastern Europe.
Teeworlds
Teeworlds is a free online multiplayer game, available for all major operating systems. Battle with up to 16 players in a variety of game modes, including Team Deathmatch and Capture The Flag. You can even design your own maps!
Strike.is: The Game
Load your gun and dominate the best multiplayer mobile shooter game!
The Ultimatest Battle
The Ultimatest Battle is a real-time, 2D platform game in which two teams compete in different game modes with an almost completely destructible environment. UB is a true Free-to-Play, absolutely no Pay-to-Win.
Super Crate Box
Vlambeer's SUPER CRATE BOX is coming to bring back the glory of the golden arcade age, when all that really mattered was getting on that high score list. Grab your baseball cap and loosen your pants, it's time to fight endless hordes of enemies and collect every weapon crate you can.
Formicide
Formicide is a fast-paced 2D online platformer with a lineup of versatile classes. Think Worms meets Team Fortress 2. Face off with teammates against enemies in destructible environments with the weapons and abilities at your disposal.
BLOCKPOST LEGACY
Procedural cubic 3D-shooter in the best traditions of the genre. The game is a rich cocktail consisting of the most popular and functional gaming solutions. Customization of characters, opening cases and improving the existing arsenal — all this is available in the game now!
Apotheon Arena
Apotheon Arena is the free online-multiplayer complement to the mythic Greek action RPG, Apotheon. Pit your skills with spear and shield against other players in brutal bronze-age combat. Battle across the statuesque arenas of Olympus, depicted with beautiful black-figure pottery artwork.
pla_toon
pla_toon is an action-packed, first-and-third-person, multiplayer, light-hearted, cartoon-style shooter where you as play a soldier. Join the multiplayer battle and be the first to a para-crate drop to equip your player with powerful weapons! Or get on an ostrich and ride off into the sunset...
Pink Heaven
A certain office lady is back!!
Super Blue Boy Planet
SBBP is a 2D platformer with pixel graphics. Blue boy’s girlfriend is kidnapped by aliens so he goes through 21 levels to save her and he also fight bosses along the way.
Fork Parker's Holiday Profit Hike
Against explosive firepower, bitter cold, and dizzying heights, Fork Parker must outwit a group of no-talent game developers in a deadly holiday promotional game. Also, it's free.
Dead Maze
Dead Maze is a 2D MMO game set in a destroyed contemporary world, filled with zombies. Explore the world, scavenge and craft as many items as possible, to survive the hostile environment and upgrade your gear and camp as you go.
Of Guards And Thieves
Of Guards and Thieves is a multiplayer stealth game in which high-powered guards face off against fast and elusive thieves in a contest of wits. Outsmarting the enemy and shooting your way through to the goal are equally valid strategies. Simple rules, emergent gameplay and high replayability.
Deuterium Wars
Deuterium Wars is a rapid 2D shooter. Create your own aircraft and plunge into heated battle with other players. What awaits you: an extensive role-playing system, craft, trading, and much more on a single server for all platforms.
Guns and Robots
Guns and Robots is free to play online third person shooter. The game brings robot action with massive customization. Players get cartoony bright 3D graphics in attractive environments and challenge each other in open arenas.
SAS: Zombie Assault 4
Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing.
King Arthur's Gold
Would you enjoy building CASTLES, traps and siege machines in MULTIPLAYER? And then undermine your opponents castle and collapse it with 2D PHYSICS & DESTRUCTION?
WARMODE
Free to play shooter about the confrontation of two irreconcilable sides, represented by the government military housings and the armed hirelings. Try your hand at virtual battles with off-scale dynamics and hurricane gameplay in the spirit of the classical shooters.
Cartoon Strike
"Different realities, different rules, but always fun". In the multiplayer game Cartoon Strike, each map offers a different gaming experience. Players can enjoy a few minutes of fighting in the WWII, followed by a few minutes in the present, future or even funny mode.
Grimoire: Manastorm
A free multiplayer wizard FPS which features six classes to master with thousands of possible spell loadouts. Choose your class of magic, customize your spell book with dozens of abilities, and battle against others for supremacy in FFA or Conquest, or go solo to survive against waves of the undead.
Superfighters Deluxe
Superfighters Deluxe is a unique action game that combines brawling, shooting and platforming in dynamic sandboxy 2D levels. Lots of weapons and fun gameplay systems interlock to create absurd action-movie chaos.
Double Action: Boogaloo
Double Action is a free stylish multiplayer game about diving, flipping, and sliding your way into action movie mayhem.
Pixel Worlds: MMO Sandbox
Award winning indie game studio Kukouri welcomes you to our multiplatform MMO sandbox: Pixel Worlds! (” Best Indie Game Developer ” Global Mobile Game Awards 2019) Play free with friends, create your own worlds and stories. Fight off the enemies and get awesome items in this award winning indie MMO!
Zula Global
Zula is an intense free-to-play FPS in which you can play cooperatively with your teammates to overthrow the enemy side. You can enjoy new content weekly and receive gifts every day. Variety of maps and weapons from the real world so you can immerse yourself 100%.
Alien Swarm
Co-operative multiplayer game and complete code base available for free.
Red Eclipse
Building on over 15 years of gameplay design, Red Eclipse continues to focus on fast paced, agile, easily accessible first person shooter gameplay. For creators, the full power of the Tesseract engine is at your fingertips in the included realtime multiplayer editor.
BattleRush
Free-to-play multiplayer action game in the entourage of the Second World War with total destructibility of the environment. Enjoy full freedom, build a defense, create your army, crush the enemy.