You've seen the design, and now Valve is showing gamers how its Steam Controller works in practice. The company has posted a new video to its YouTube account that demonstrates how the unique gamepad functions when being used with popular games like Portal 2, Civilization V, and Counter-Strike: Global Offensive. It's not quite the finished design that Valve showed off last month; what you're seeing here is the same prototype controller that will be distributed to Steam Machine beta participants later this year. Valve says that more demos will follow soon, "including footage of some other game developers using the controller to play their own games." Is it a worthy replacement for your trusty keyboard and mouse? Reach your own conclusions after watching the clip below.