- last post: 01.01.0001 12:00 AM PDT
Bungie do class the game as a Campaign Expansion although it is being treated and looks like a Full Campaign Game to me. It is set weeks before the events of Halo 3 so it's a Prequel not a Add-On
Edit 1 - Guitar Hero: Aerosmith isn't a Add-On. It is a full game which comes with a Guitar Hero Controller. It can be played without the use of Guitar Hero 3. A example of a Add-On is the Halo 3 Mythic Map Pack. It "Adds On" to the Halo 3 Experence.
[Edited on 06.02.2009 1:31 PM PDT]