We first started hearing about the HD update the original Halo Xbox game was undergoing back in February. Then Microsoft started hinting at it and showed a demo at E3, but we haven’t really got to see any extended segments of gameplay from Halo: Combat Evolved Anniversary until now.The video above has just been released and includes gameplay from the E3 build. The main focus of the walkthrough is showing off the updated visuals and the fact this is the exact same gameplay and campaign we were all enjoying a decade ago.AdChoices广告343 Industries, who were tasked with updating the game for Microsoft, managed to update the look without effecting the gameplay by using a hardware trick. They figured out a way to run the original game engine at the same time as the new one supplying the HD visuals. So in effect this is a true run through of the original, just with a veil of HD painted over the top. To prove that is the case, 343 has included Classic Mode, which at the push of a button reverts the graphics back to the original 2001 version. This is a nice option to have, as once you’ve become accustomed to seeing all games in HD, it’s easy to forget what we used to class as cutting edge graphics. The fact it is accessible on a button press means you can easily check out how the more detailed areas used to look. The water especially has seen a major improvement, as have the effects such as water splashes and dust.The other feature of this game that’s going to get Halo fans excited is the ability to play co-op over Xbox Live. We can imagine Live is going to be buzzing for months when the game gets released on November 15.One final point to make is the visuals on display in the video are now several months out of date, meaning when the game does ship it will look even better than it already does here.