Bungie has released a new video for Halo: Reach, featuring the developer commentary over a walkthrough.
Basically, it's the guys playing the Tip of the Spear campaign.
If you wish to remain pure until the game's release next week, watch this video instead.
Those who don't like surprises, or just want to know what to expect, have at it.
Halo: Reach is out September 14 on Xbox 360.