No because they have made new maps and it's an entire new game, also it's before the first halo we have ever played.
You buy the map pack at marketplace or buy halo anniversary
The noble map pack.
Defiant Map Pack
there are three
You can't. Legally, anyway.
Two multi-player map packs. Noble Map Pack and Defiant Map Pack
March 2011
No, I'm sorry but you cannot spawn computers or laptops in halo reach. You may be able to on some of the Noble Map pack or Defiant map pack maps as I have not played them, but I doubt it as well
muythic map pack. that comes with HALO 3: ODST
Yes, it just came out. It is called the Anniversary map pack and has 5 maps from Halo Combat Evolved. The maps are Ridgeline, High Noon, Penance, Breakneck, Solitary, and Battle Canyon. There is also a firefight map from Halo CE's campaign called Installation 04. The map pack costs 1,200 Microsoft Points but is really worth it. You can also get the map pack also by buying a NEW copy of Halo CE Anniversary which is $40. If you buy Halo CE Anniversary used there is a low chance of getting an unused code for the map pack.
if you buy the halo wars LCE you get a code for the new mythic map pack on Halo 3
1200 gamer points, or around 10$