I have two sleeper hits to choose from (Legend of Grimrock and Risen 2: Dark Waters) for the best Windows PC game of April 2012!
Game: Legend of Grimrock
Key Game Features:
Old-school dungeon crawling gameplay with stunning modern 3D graphics.
A wide variety of weapons and spells.
Thousands of squares, riddled with hidden switches, pressure plates, sliding walls, floating crystals, forgotten altars, trapdoors, and more.
Trailer:
Editors Opinions: Dungeon crawling titles are making a comeback, and Legend of Grimrock leads the way! If you're planning on purchasing this game -- purcahse it GOG.com where you can score the following bonus content:
Game: Risen 2: Dark Waters
Key Game Features:
A huge variety of themed island locales.
Shape the game world based on their own decisions.
highly interactive environment.
Trailer:
Editors Opinions: The first Risen was fantastic. That game featured a cool island to explore, with plenty of quests, and a decent amount of skills to learn. Risen 2 : Dark Waters improves upon that game, with more of everything! Sadly, most RPG fans ignored the first Risen, and will most likely ignore this sequel. Don't make that mistake!