Best Games by Popularity: A

Anomaly 2 is a real-time strategy game that takes the tower offense concept from Anomaly Warzone Earth to a new level.. The game takes places in the years following the invasion of Earth in 2018, where the planet is overrun by alien machines and humankind is on the verge of extinction. Read the Review

It's a suitably excellent expansion to what remains one of the best real-time strategy games to date. Read the Review

Age of Empires II: HD Edition lets you explore all the original single-player campaigns from both Age of Kings and The Conquerors expansion, choose from 18 civilizations spanning over a thousand years of history, and head online to challenge other Steam players in your quest for world domination throughout the ages. Read the Review

Antichamber is a game about discovery where geometry and space follow unfamiliar rules, and obstacles are a matter of perception. Read the Review

Aion is an MMOG from NCsoft in which divine beings battle for control of the skies and the earth. Read the Review

Age of Wushu is a free-to-play martial arts MMORPG that is set in ancient China where players can relive more than 2,000 years of Wuxia tradition.

Arma III is the brand-new installment in this series of critically acclaimed realistic military simulators.

Alan Wake is a psychological action thriller set in the American Northwest. Read the Review

Age of Empires III lets you play as a European superpower bent on exploring and conquering the New World. Read the Review

Anno 2070 takes place in a near-future environment where climate change has forced humanity to adapt to rising sea levels that have left stretches of once-fertile land completely inhospitable. Read the Review

Amnesia: The Dark Descent is a first person survival horror game about immersion, discovery and living through a nightmare. Read the Review

The first game in the Assassin's Creed franchise is set in 1191 AD, when the Third Crusade was tearing the Holy Land apart. Read the Review