Yes, it is called Forge and is shipped with the game.
Forge is not in Halo 2 and comes out in Halo 3 and Reach
it comes with halo 3 ODST
get a new halo 3 disc
The first one
no no
No. You can not be "Halo" in the Halo Series. You play Master Chief in Halo: CE - Halo 3. You play as Noble in Halo: Reach.
The only other games I can think of with a Level Editor mode are the Tony Hawk games.
Cortana =]
Snowbound.
By gaining XP
Sorry to tell you but... She got shot with a Spiker at the end of the Halo 3 Level, "The Covenant."
Halo 2 doesn't have one.