A homebrew version of Halo has been coded up by some guy named Ed. This guy Ed is really Ed Fries, the vice-president of game publishing for Microsoft during the original Xbox’s lifescycle. Read more about him on Wikipedia. Because of this, Ed is in a unique position – he had Bungie’s blessing to do this. From the AtariAge forum thread, the employees of Bungie already have their cartridges of Halo 2600.
I played a bit of it using my Harmony cart, and it is very well done. Simplistic in gameplay, but that is to be expected. Here is an initial impressions video someone else did off of youtube.

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I might have to pick a copy of this up as well.
Yeah, it’s tempting. May be awhile before it shows up.
I’ve never played Halo so it’s probably blasphemy to the die-hard Halo fan that I’d even be interested. But after seeing the gameplay video, I kind of think it looks like an awesome game!
I put in another half hour into it last night… making progress. Definitely gets harder as you get deeper into the maze Wish there was some form of scoring system.
This has definitely inspired me. Programming a half-way decent 2600 game is on my bucket list now. All sorts of tools and tuts to make it easier for an amateur like me. I have an idea… just need to do it.
Albert is taking order right now. Need to get the order in before the weekend.
http://www.atariage.com/forums/topic/167142-halo-2600-pre-order/