Valve has released a proper introduction for Portal 2's two player co-op mode today. The new CG trailer provides a glimpse at the two playable characters in action.

The co-op mode has its own story and levels. Players step into the role of two unnamed bots, each armed with a portal gun. The co-op can be played via split-screen on consoles and over the Internet for all versions.

Portal 2 will land on the PS3, PC, Xbox 360, and Mac on February 9th, 2011.