Go use Cheat engine, it works for both multiplayer and campaignwow those guys on rework3d forums are a bunch of ****** pricks.
http://www.rework3d....=871326#p871326
bastards. They wanted me to use ****** CHEAT ENGINE ON HALO 2!!! ***** noobs omg
lol..
Gravemind can only mod campaign maps, but this is an easier method.
The reason why multiplayer maps cannot be modded, is because the tags are all external to the map itself, they are only referenced where to retrieve them (shared.map) and load them via memory, and there are encrypto-checks on MP and shared.map, and the person who figured out "Bypass map checksum" for H2V doesn't care.
The game is dead, because it was either too complicated, or just ultimate fail.