Great co-operative survival game with a quirky art asthetic and sense of humor.

An Early Access, space-based sandbox game with huge potential. Build ships and stations, harvest materials and also enjoy space combat!

Sandbox, terraforming MMO thing!

Think Terraria, but with unlimited progressively generated planets you can jump between, and a much larger build system.

Possibly the best game Valve has ever made. The first person puzzle solver added co-op with its sequel.

It is basically 2D MineCraft. There is nothing wrong with that.

Tower defense with four-player co-op. You both set up your defenses and control and avatar in the game world.

Another vision of what "Diablo III should have been." Not as dark as Diablo III but with fantastic gameplay and a lighter art style.

Side-scrolling action beat-em-up with four-player co-op and a light hearted visual style.

Sci-Fi first person shooter that supports four-player co-op through the entire campaign and DLC.