Valve reveals that the latest update for the first-person puzzle game, Portal 2, features a few new improvements, chief among which is the addition of the split-screen co-op 'Big Picture' mode.

Here's the official word:

Big Picture Support

• Added 2 controller splitscreen support for Standard Co-Op. Press X on the second controller inside the first Co-op menu to activate it.
• Fixed controller's 'quick ping' button causing the player's movement to stop.
• Fixed not being able to exit Robot Enrichment or Create Test Chambers menus with the controller.