Games like SENTRY on Steam
            
              
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        TimeShift™
      
      
        Master time to become the ultimate weapon! Dr. Aiden Krone has made a Time Jump across the space-time continuum - a reckless act with frightening consequences. Now, a disturbing alternate reality has evolved within the bleak and rain-soaked Alpha District.
      
    
    
  
      
        Half-Life: Source
      
      
        Winner of over 50 Game of the Year awards, Half-Life set new standards for action games when it was released in 1998. Half-Life: Source is a digitally remastered version of the critically acclaimed and best selling PC game, enhanced via Source technology to include physics simulation, enhanced effects, and more.
      
    
    
  
      
        Surviving Mars
      
      
        There will be challenges to overcome. Execute your strategy and improve your colony’s chances of survival while unlocking the mysteries of this alien world. Are you ready? Mars is waiting for you.
      
    
    
  
      
        Heretic's Fork
      
      
        Dear candidate, we are pleased to invite you to take up the position of manager of Hell. You will punish sinners by using our deck-building computer system to construct hellish towers capable of keeping the endless hordes of the underworld in check. Best of luck!
      
    
    
  
      
        SiN Episodes: Emergence
      
      
        You are John Blade, commander of HardCorps, an elite security force dedicated to protecting the people of Freeport City. Four years have passed since your first battle with Elexis Sinclaire, a beautiful, brilliant, and ruthless scientist who is out to remake humanity according to her own twisted vision.
      
    
    
  
      
        Creeper World 3: Arc Eternal
      
      
        Creeper World 3 is what happens when cellular automata takes over a strategy simulation. Instead of discrete units that attack your base, a fluid-like substance spreads over the terraformable terrain. Your base, your weapons, your strategy... you must adapt them all.
      
    
    
  
      
        Deep Space Battle Simulator
      
      
        Two teams of players control their capital ship in an epic battle. Customize your ship, control its movement, weapons, and energy distribution or go to one of the hangars to join the battle in a smaller fighter!
      
    
    
  
      
        Half-Life: Opposing Force
      
      
        Return to the Black Mesa Research Facility as one of the military specialists assigned to eliminate Gordon Freeman. Experience an entirely new episode of single player action. Meet fierce alien opponents, and experiment with new weaponry. Named 'Game of the Year' by the Academy of Interactive Arts and Sciences.
      
    
    
  
      
        The Perfect Tower II
      
      
        The Perfect Tower II is a mix between an incremental and a tower defense game. Build a town, manage resources and explore a variety of mini-games and tons of upgrades. Fully automate your game and watch numbers going up!
      
    
    
  
      
        STAR WARS™ Dark Forces (Classic, 1995)
      
      
        Behind a veil of secrecy the evil Empire is creating a doomsday army - one that, if finished, will become the final cog in the Empire's arsenal of terror and domination. Your Mission? Join the Rebel Alliance's covert operations division, infiltrate the Empire.
      
    
    
  
      
        Half-Life: Blue Shift
      
      
        Made by Gearbox Software and originally released in 2001 as an add-on to Half-Life, Blue Shift is a return to the Black Mesa Research Facility in which you play as Barney Calhoun, the security guard sidekick who helped Gordon out of so many sticky situations.
      
    
    
  
      
        Orcs Must Die! Deathtrap
      
      
        Orcs Must Die! Deathtrap combines chaotic third-person combat with devious trap-laying strategy. Enjoy endless replayability as your War Mage grows stronger through roguelite progression. Repel relentless orc hordes solo or with up to 4 players.
      
    
    
  
      
        Half-Life 2
      
      
        Reawakened from stasis in the occupied metropolis of City 17, Gordon Freeman is joined by Alyx Vance as he leads a desperate human resistance. Experience the landmark first-person shooter packed with immersive world-building, boundary-pushing physics, and exhilarating combat.
      
    
    
  
      
        The White Laboratory
      
      
        The White Laboratory is a sandbox style physics-based tower defense and RTS game in which you modularly build and command robotic structures. Use them to defend against or conquer other disobedient mechanical blocks on a facility floating in the atmosphere of a remote gas planet.
      
    
    
  
      
        Toaster Arena
      
      
        Toaster Arena is a first person multiplayer arena shooter where players battle it out on different maps and game modes. Use Advanced movement to traverse obstacles and gain the advantage on the battlefield.
      
    
    
  
      
        Hard Reset Extended Edition
      
      
        Over-the-top destruction, loads of enemies & a beautifully realized cyberpunk setting. Hard Reset is here to shake up the shooter scene. Try the demo now.
      
    
    
  
      
        Ancient Planet Tower Defense
      
      
        Ancient Planet is classic tower defense game. The stronghold of an ancient civilization has been invaded by hordes of alien raiders. Use powerful technologies of the Ancient and repel the attack of the enemy's armies!
      
    
    
  
      
        PixelJunk™ Monsters Ultimate
      
      
        Tikiman the Forest Defender is in trouble. Hordes of monsters are sweeping through his realm, hoping to chow down on his offspring – and it’s up to you to defend them. By placing weapon towers at strategic points around the landscape, you can destroy the invaders and save the little ones.
      
    
    
  
      
        Crysis 2 - Maximum Edition
      
      
        Aliens are decimating New York City, only you have the technology to survive. Be The Weapon.
      
    
    
  
      
        Earth 2150 Trilogy
      
      
        Your heroes and your armies will need strong leadership to take them on a spellbinding odyssey that has everything a gamer’s heart could wish for breathtaking worlds in space, battles against cunning enemies and even downright treason from your own government faction - are you up to it?
      
    
    
  
      
        变量 Variables
      
      
        We created this unique single player game with a combination of Tower Defence and Roguelike. Come and create your maze, build your turret, defeat the invaders, and save the world!
      
    
    
   
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    