Age of Empires II is a monument to the glory days of sprites, battlefield evangelism, and real-time strategy, and you'll be able to get another shot at spreading your influence around the world when an HD version of the game arrives next month. Age of Empires II: HD Edition is based on Age of Empires II: Age of Kings, released in 1999, and has been visually remastered with new textures, effects, and support for 1080p displays and multiple monitors. Eurogamer reports that the reworked version will feature the entire single-player campaign through the Conquerors expansion, and support for Steam's social features: including achievements, leaderboards, and matchmaking. Age of Empires II: HD Edition will be sold for $20 exclusively on Steam starting April 9th.