« Would you like to play a game... together? Sure. How about Global Thurmonuclear War? »

« Collaborative zombie shooting in easy to digest, grindhouse theater style packages. What could be better? »

« The latest and greatest in this classic strategy game series allows players to cooperate or compete across the entirety of human history. »

« Valve's cooperative zombie shooter's unique twist allows for asymmetric play where survivors pit themselves against someone controlling special zombies. »

« An enticing classic RPG in the vein of the original Baldur's Gate that allows co-op partners to take over members of your adventuring party. »

« The sequel to Portal deepens the world and story of Black Mesa's competitor, Aperture Science, and adds a special co-op mode and level designer. »

« The first game mechanic that felt really fresh and new for years, in a game that oozes ambiance and humor. »

« An old school style 2D roguelike dungeon crawler based around 4-player coop. Requires (and includes) Mono to run on OSX but supports crossplatform play. »