Today might be the first day that PAX is officially open, but our first day in Seattle was actually Thursday (yesterday, if you're keeping score). We spent the day at the Microsoft campus trying out some of the stuff the company will have on the show floor, including some new XBLA games, Halo 3: ODST and Left 4 Dead 2. We also take you deep into Microsoft's top secret parking garage.

See it all in the video above, and be sure to hit the HD button in the player.

This article was originally published on Joystiq.

WRUP: PAX attax