This product includes 2 items: base game and The Forgotten Expansion In Age of Empires II: HD Edition, fans of the original game and new players alike will fall in love with the classic Age of Empires II experience. 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. Originally developed by Ensemble Studios and reimagined in high definition by Hidden Path Entertainment, Microsoft Studios is proud to bring Age of Empires II: HD Edition to Steam! Welcome to Age of Empires II HD - The Forgotten; the first official expansion for the Age of Empires II universe in over ten years. Challenge friends with five additional civilizations and technologies, battle through four campaigns, vanquish opponents in new game modes on massive maps, or shoutcast a match and stream it all through twitch.tv. Crafted exclusively for Age of Empires II: HD Edition; The Forgotten expansion builds upon the Age of Empires II: HD experience and includes Steam workshop support, new expansion rankings, steam trading cards, and more!