This game is not what you usually see on Steam. In Garry's Mod, you enter a physics sandbox which provides you with tools to make what you want happen and leaves you to it. You can play alone or join thousands of other players kidding around and playing with physics. If you do try this game, do check out its Steam Community Workshop

Garry's Mod or GMod (stylized as garry's mod) is a sandbox physics game using a modified Source engine, created by Garry Newman. Garry's Mod was originally a modification, a "mod", for Valve's Half-Life 2, but was later made into a standalone game. I ...   more on Wikipedia

System Shock 2 Steam Key GLOBAL is a game released on 2000-08-11. Published by Nightdive Studios.

System Shock 2 is a first-person shooter action role-playing survival horror video game for Microsoft Windows, Apple OS X and Linux. The title was designed by Ken Levine and co-developed by Irrational Games and Looking Glass Studios. Originally inten ...   more on Wikipedia

XCOM: Enemy Unknown is an action strategy game developed by Firaxis Games. Play as the commander to a special paramilitary unit called XCOM. Your job is to protect earth from global alien invasion. Manage resources, advance technologies, and plan out individual units as well as global scale strategies to fend off the invading foe! Engage in over 70 unique missions, interact and negotiate with world governments, research alien devices and customize your own instruments of death! Build a base, develop it, grow your own units and participate in turn-based close combat!

XCOM: Enemy Unknown is a turn-based tactical video game, developed by Firaxis Games and published by 2K Games. The game is a "reimagined" remake of the 1994 cult classic strategy game UFO: Enemy Unknown (also known as X-COM: UFO Defense) and a reboot ...   more on Wikipedia

Anyone looking for the ultimate RPG sandbox experience should look no further than Mount & Blade: Warband key! The game still has plenty to offer for the modern gamer, even 9 years after its initial release and it is easy to see why. Untamed freedom With Mount & Blade: Warband key, you’re not limited by a restricting storyline, even though there is a story to the game. That means you can just go out and do whatever you please in a massive world, which makes Warband as replayable as a game can get. Add an amazing price to the game and there is no reason why you shouldn’t buy Mount & Blade: Warband key right now! Become Powerful! The game is not about starting off as a powerful character, instead, you start off as nothing more than a peasant set out to strive for greatness. And great you become, as you traverse the vast lands, going to battle with a plethora of opponents. The more you do, the more powerful you become and soon enough you will turn into a fierce leader, leading a large army of men who all wish they were you! What To Expect? One thing you won’t get with a Mount & Blade key is a thrilling storyline and amazing graphics, as not only is the game dated in those aspects, it was never about them in the first place. What you can expect is an adventure that allows you, the player, to take control of everything by yourself. Nobody is forcing you into completing side quests, or even main quests for that matter, as you do whatever you want, whenever you want! If you want a classic sandbox experience, don’t miss out on this one!

Mount & Blade: Warband is the first sequel to the action role-playing video game Mount & Blade. First announced in January 2009, the game was developed by the Turkish company TaleWorlds Entertainment and was published by Paradox Interactive on March ...   more on Wikipedia

The age of silent, stealthy, deadly ninjas is not over! Become one of them in Mark of the Ninja, a Klei Entertainment action adventure. An immersing story coupled with awe-inspiring animation and scenery is sure to have you loose track of time and sense of reality while you’re playing the game! You have a choice of becoming a silent assassin or an invisible ghost as you make your way through the story, gathering the perfect toolset for your style of play.

Mark of the Ninja is a side-scrolling action stealth video game developed by Klei Entertainment and published by Microsoft Studios. It was announced on February 28, 2012 and later released for the Xbox 360 via Xbox Live Arcade on September 7, 2012. A ...   more on Wikipedia