Games like DEFCON on Steam
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Dungeon Defenders: Awakened
Dungeon Defenders: Awakened is co-op Tower Defense combined with epic Action RPG combat. You’re able to join forces with up to four players to take on a never-ending army of orcs, demons, and dragons! Are your defenses strong enough to save the world of Etheria?
Tom Clancy's Rainbow Six® Vegas 2
Tom Clancy's Rainbow Six® Vegas 2 - the sequel to the award-winning next-generation first-person shooter - returns to Sin City. Tom Clancy's Rainbow Six Vegas 2 is your last chance to rescue America's sexiest city from an escalating terrorist siege that will force you into heart-pounding action from beginning to end.
Oasis VR
Oasis is an amazing virtual environment where you can make new friends around the world! You can chat with them, play poker, go bowling, or even arrange a home party in several virtual worlds. You can also create your own avatars for you and your friends!
FurryFury: Smash & Roll
A dynamic beast-rolling turn-based online arena puzzle brawler on physics.
ICBM: Escalation
ICBM: Escalation is a grand RTS where you command armies, develop cutting-edge tech, and wield devastating weapons. Conquer enemies with conventional forces or nuclear firepower. With new modes like Standoff and Conquest, the game offers deep strategic layers in a global warfare setting.
Worbital
With the shifting gravity on your side, aim your cannons, blast your enemies and enjoy the fireworks. Worbital is a real-time strategic artillery game in space, peppered with a heavy dose of cosmic chaos. The goal: be the last civilization standing!
Circle Empires Rivals
In this fast-paced multiplayer RTS, you and your friends will take control of your own tiny kingdoms and conquer a world made of circles. Each one is overflowing with enemies to fight, monsters to hunt and loot to hoard – but watch out... Friends can quickly become rivals!
The Escapists 2
Craft, Steal, Brawl and Escape! It’s time to bust out of the toughest prisons in the world as you return to the life of an inmate in The Escapists 2, now with multiplayer! Have you got what it takes to escape?
Tom Clancy's Rainbow Six® Siege X
Rainbow Six Siege X is the reference in tactical team shooters, where elite strategy and execution triumph. Enjoy free access to Quick Match, Unranked and Dual Front game modes with a selection of operators.
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!
Bloons TD 6
The Bloons are back and better than ever! Get ready for a massive 3D tower defense game designed to give you hours and hours of the best strategy gaming available.
Thunder Tier One
Thunder Tier One is a realistic top-down shooter where you join an elite special operations team tasked with stopping a dangerous terrorist organization wreaking havoc across the fictional Eastern European country of Salobia.
It Takes Two Friend's Pass
Download Friend's Pass* and play It Takes Two with a friend for free. Just grab a friend who owns the full game, download Friend's Pass for free, and play together!
Secret Neighbor: Hello Neighbor Multiplayer
Hello Neighbor Multiplayer. Secret Neighbor is a Multiplayer Social Horror Game where a group of intruders try to rescue their friend from the Neighbor's creepy basement. Only problem is one of the intruders is the Neighbor in disguise.
Warhammer 40,000: Dawn of War II: Retribution
Command any of the six unique factions in the next standalone expansion of the critically acclaimed Dawn of War real-time strategy franchise. Choose to build a massive army or lead a small squad of elite heroes into battle and experience a single player campaign customized to your favorite race.
Liar's Bar
Dive into this multiplayer online experience set in a sketchy bar where the games are as dangerous as the patrons. Join a table of 4 and test your skills in Liar's Dice and Liar's Deck, where lying and bluffing are key to victory. Ready for a night at Liar's Bar?
Company of Heroes 2
Experience the ultimate WWII RTS platform with COH2 and its standalone expansions. This package includes the base game, which you can then upgrade by purchasing The Western Front Armies, Ardennes Assault and/or The British Forces. More info in the "About This Game" section below.
Dungeon Defenders
Create a hero from one of four classes to save Etheria in this 4-player coop Tower Defense Action-RPG. Includes Steam exclusive Portal gun & TF2 familiars!
Police Stories
A fresh take on top-down shooters with an emphasis on tactics that forces you to make split second decisions. Neutralize criminals, rescue civilians and defuse bombs in Single Player mode or Co-op. And remember - shooting first is not an option!
The Red Solstice
2280 A.D. The last few survivors of a ruined Earth seek a new home: Mars, a planet whose inhabitants didn't take too kindly to outsiders. The Red Solstice is a tense, tactical, squad-based action game. Fight to survive with up to 8 players in co-op, or lead your own squad in single-player mode.
Legion TD 2 - Multiplayer Tower Defense
An infinitely replayable multiplayer and single-player tower defense. Defend against waves of enemies and destroy the enemy's king before they destroy yours. Legion TD 2 is a one-of-a-kind game of tactics, teamwork, and prediction. Party as 1-8 players.
Mining Mechs
Unleash your inner miner as you commandeer a high-tech Mining Mech! Mine for valuable resources and upgrade your mech for even bigger hauls as you explore the underground. Fun to play alone or with up to 7 friends in online co-op multiplayer!
GTFO
GTFO is a hardcore cooperative horror shooter that throws you from gripping suspense to explosive action in a heartbeat. Stealth, strategy, and teamwork are necessary to survive in your deadly, underground prison. Work together or die together.