Games like POLYGON on Steam
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RUSSIA BATTLEGROUNDS
RUSSIA BATTLEGROUNDS - is a online Battle Royale shooter in which players fight for their homeland. Only your fierce anger and cruelty will help you survive in this bloodbath.
Quake II
You are humanity’s last hope to stop the Strogg, a hostile alien race waging war against Earth. Play this military sci-fi FPS, now upgraded for modern platforms with improved visuals, new campaign content, online multiplayer/co-op, and more.
Bloodline Champions
Bloodline Champions is a Free-to-Play online PvP Arena game where players engage in short, intense battles of up to ten players divided into two teams. Each player takes control over one of several bloodlines, each with their own unique weapons and abilities. Easy to learn, challenging to master.
Hazard Ops
Ready for the next generation of 3rd person shooters? Hazard Ops has zombies, monsters, robots, dinosaurs, mechs - pretty much anything you can point a gun at. Sink your teeth into this action-packed online shooter!
Red Orchestra 2: Heroes of Stalingrad with Rising Storm
Contains full Rising Storm content as well!
CRSED: Cuisine Royale
CRSED: Cuisine Royale – is a brutal MMO last-man-standing shooter with realistic weaponry, elements of lethal mystic forces and incredible superpowers!
Quake III Arena
The greatest warriors of all time and space have been summoned to battle for the amusement of an ancient alien race. Wield a variety of guns and power-ups as you fight for glory against ruthless combatants in this fast-paced single-player and multiplayer FPS.
Blood and Bacon
This Co-op Shooter , has Day and Night levels, multiple maps, players will take on 25 enemy types and numerous bosses, like Gargantuan Monsters and Minibosses every 10 days as you explore, shoot and run for your life against the onslaught of porcine monstrosities.
F.E.A.R. 3
F.E.A.R. 3 delivers all the hallmarks that define the F.E.A.R. brand: terrifying paranormal experience, frenetic combat and a dramatic storyline.
Pirate Fighting Simulator
Pirate Fighting Simulator is a free multiplayer PVP game where you can fight friends or randoms on an island arena
Climb
You thought you were the only rock climbing hipster around, but these mountains are full of them. Eliminate all competition and claim your rock! Climb, an online multiplayer brawler with short and action packet game sessions!
Alien Swarm
Co-operative multiplayer game and complete code base available for free.
Silica
Silica blends FPS and RTS in epic, photorealistic battles. Choose to fight on the ground or command from above as humans or aliens. Dive into thrilling multiplayer combat or master strategic command. Are you ready to survive and conquer?
STAR WARS™ Battlefront™ II
Be the hero in the ultimate STAR WARS™ battle fantasy with STAR WARS™ Battlefront™ II: Celebration Edition!
DCS World Steam Edition
Feel the excitement of flying the Su-25T "Frogfoot" attack jet and the TF-51D "Mustang" in the free-to-play Digital Combat Simulator World!
DEATHLOOP
DEATHLOOP is a next-gen FPS from Arkane Lyon, the award-winning studio behind Dishonored. In DEATHLOOP, two rival assassins are trapped in a mysterious timeloop on the island of Blackreef, doomed to repeat the same day for eternity.
MechWarrior 5: Clans
In MECHWARRIOR 5: CLANS, players become new Smoke Jaguar pilots in the Clan Invasion of the Inner Sphere. Lead a five-mech "Star" squad across diverse planets, engaging in an expansive campaign with immersive gameplay and intricate combat. Customize BattleMechs and explore strategic options.
I Am Sakuya: Touhou FPS Game
Dodge bullets, shoot enemies and even stop time as you navigate through 15 beautiful levels in this perfect blend of bullet hell and FPS. Uncover the origins of Sakuya Izayoi's past and investigate the mansion where the scarlet vampires resides in this Touhou Project Fangame!
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.
Painkiller Overdose
The critically-acclaimed and award-winning FPS franchise is back! Packed with tons of fast-paced, adrenaline-fueled single player and multiplayer action, Painkiller Overdose brings with it 6 innovative new demonic weapons, mind-bending physics, lightning-player maps, over 40 demented and sickly-twisted monsters from Hell and gigantic end...
Screencheat
Screencheat is a ridiculous competitive split-screen first-person shooter where everyone is invisible, so players are forced to look at each other’s screens to win. Supporting both local and online multiplayer, combat in Screencheat is fast and furious with a wide variety of one-hit kill weapons.
Century: Age of Ashes
Century: Age of Ashes is a free-to-play multiplayer dragon shooter. Master a growing roster of classes and dragons, compete in intense arena battles and rule the skies in fast-paced aerial combats.
J-Jump Arena
J-Jump Arena is a free-to-play, turn-based elimination party game, in which you'll probably blow yourself up - but still have a good time doing it! Think you’ve got the brains to survive the chaos?
Far Cry® 4
Hidden in the towering Himalayas lies Kyrat, a country steeped in tradition and violence. You are Ajay Ghale. Traveling to Kyrat to fulfill your mother’s dying wish, you find yourself caught up in a civil war to overthrow the oppressive regime of dictator Pagan Min.
Blood: Refreshed Supply™
Things are about to get… bloody! Soak up 42 pulse-pounding levels dripping with Lovecraftian atmosphere as you battle your way through armies of sycophantic cultists, zombies, gargoyles, hell hounds, and other insatiable horrors, in your quest to defeat the loathsome Tchernobog.
Deadswitch Combat
DEADSWITCH COMBAT is a fast-paced 2D multiplayer shooter. Experience action-packed combat with hundreds of weapons, vehicle combat, and plenty of team-based game modes.
Tank Force: Online Shooter Game
Tank Force - the coolest free online tank shooter! This is a new word in online tank battles, which combines the best qualities of a tank simulator and thrilling arcade battles.
STAR WARS™ Battlefront (Classic, 2004)
Fight the greatest battles in the STAR WARS universe any way you want to. The choice is yours.
Six Days in Fallujah
Six Days in Fallujah is an intensely realistic first-person tactical shooter based on true stories from one of this century’s toughest urban battles.
Grapple Tournament
Grapple Tournament is a VR Grappling Hook Shooter with 3D movement freedom, fast-paced vertical combat and dual wieldable multifunctional weapons. Now Free-To-Play!
World of Warships
Immerse yourself in thrilling naval battles and assemble an armada of over 600 ships from the first half of the 20th century — from stealthy destroyers to gigantic battleships. Change the look of your ship, choose upgrades to suit your play style, and go into battle with other players!
Masked Forces
Masked Forces is an action-packed game where your main purpose is to eliminate your enemies using any means necessary. You have a great singleplayer campaign and multiple online game modes that you can use to show your might.
Classic Marathon 2
From the team that brought you Aleph One, the classic sci-fi FPS Marathon 2: Durandal from Bungie on Mac revived for modern hardware by the fan community.
BEACHED
A free-to-play, low-poly, open-world survival shooter where you’ll battle other players, explore massive monuments, and fight to stay alive. Build and fortify your base to defend against enemy raids, gather resources, and conquer a harsh, competitive world. Survival means doing whatever it takes.