In case you somehow missed our big cover reveal, Portal 2 is set to drop this upcoming holiday season at full retail price. Even though the first game was just a few hours long, the sequel promises some extra content for your return through Aperture Science, most notably the inclusion of co-op.

While we won't reveal much more (be sure to read our 12-page story in our April issue) just know the original portal isn't the last time you'll see GLaDOS. There will also be surprising new characters and brand new areas of the Aperture Science Labs. The two-player co-op mode will feature its own campaign with two new playable characters. When it comes to these mind-bending puzzles, two brains are always better than one.