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Dishonored

The game is played from a first-person perspective and allows the player to tackle a series of assassination missions in a variety of ways, with an emphasis on player choice. Missions can be tackled by stealth, combat or a combination of both. Exploring levels opens new paths and alternatives for accomplishing mission goals, and it is possible to complete all missions and eliminate all of Attano's targets in a non-lethal manner. The story and missions are modified based on violent actions, or lack thereof, committed by the player.

War in a Box: Paper Tanks

Originally an iOS app, this lightweight tower defense game features 5 types of towers versus 7 enemy vehicle classes, battling it out throughout a 24-level campaign and two difficulty modes.
A demo is available on Desura, and the game has appeared on Steam Greenlight.

XCOM: Enemy Unknown

XCOM: Enemy Unknown is a remake of the 1994 classic strategy game UFO: Enemy Unknown, also known as X-COM: UFO Defense. Unlike the previously announced XCOM by 2K Marin, this game will return to the strategic root of the X-COM series.

Emperor: Rise of the Middle Kingdom

Emperor: The Rise of the Middle Kingdom is a game about politics, trade, and city design in ancient China. In Emperor, players progress through 3000 years of Chinese history, facing ever-changing economic, military, and diplomatic challenges as each Chinese dynasty waxes and wanes.

Torchlight II

Torchlight II is the sequel to the wildly popular (and successful) action-RPG, Torchlight. The sequel brings the often requested multi-player co-op feature, through peer-to-peer multiplayer support. Torchlight II will feature randomly-generated dungeons for the player to explore, and numerous types of monsters to fight for experience and loot.

Jet Set Radio

About the Game
Tag, grind, and trick to the beat in SEGA’s hit game Jet Set Radio!

Fight for control of Tokyo-to, mark your turf with graffiti, tag walls, billboards, and even rival gang members! Perform tricks and flips on magnetically driven in-line skates, but watch out for the local police force!

Dark Souls: Prepare to Die Edition

The unexpected surprise hit and GameSpot's Best of 2009 - Game of the Year Winner Demon’s Souls now has its spiritual successor in Dark Souls. This once-in-a-generation game will take you through an experience so challenging, so punishing and yet so intensely gratifying that it will leave you anguished for wanting more. Set in a rich, dark fantasy world, experience tense dungeon crawling, fearsome enemy encounters and groundbreaking online features for a truly unforgettable gaming experience.

Darksiders II

Awakened by the End of Days, Death, the most feared of the legendary Four Horsemen, embarks upon a quest to restore mankind, and redeem his brother’s name. Along the way, the Horseman discovers that there are far worse things than an earthly Apocalypse, and that an ancient grudge may threaten all of Creation . . .

Startopia

Startopia is a real-time strategy/city management game. Set in a post-apocalyptic future, it is your job to rebuild the once-thriving network of starships and space-stations. You must compete against several other enterprises, using economic and military means to expand your power and restore life to the war-torn planets of the galaxy.

Unmechanical

You're a tiny utility robot stranded in a strange underground place. Using only the rotor on your head and the tractor beam... underneath, it's time to explore, push buttons, haul stuff around and make your way through puzzles that involve physics, logic or memory. A demo is available in Steam and also as a DRM-free download, so there's absolutely no reason not to check this lovely little game out.