Here's my thoughts: Patience my friends. If there are easter eggs left to discover, at some point in time Bungie will drop a hint and somebody will find it, and, if you no longer have the game, you can watch it on youtube or in your own personal holodeck. With Halo 2, I feel most of the big stuff has been found. People have run code in the game forwards and backwards looking for stuff. They even found the [url=http://www.youtube.com/watch?v=UmAR4CMu3zg]Flood Juggernauts[/url] that were cut from the game. I feel fairly confident all the big stuff has been found, but I could be wrong. There is still the [url=http://www.youtube.com/watch?v=dq2CGge7wNA&playnext=1&list=PLA932B09B1280F2DE&feature=results_video]Mystery Gate Button[/url]. With the other Halos, to be honest, I haven't kept up with it that much, but one of two things will happen: 1) Somebody through pure determination and a bit of luck will stumble on the mother of Halo secrets, will be heralded and made a demi-god by the community, be given access to Bungie swag for life, and have a section in a Cracked article mentioning their name for finding this insane easter egg. Now if that easter egg is out there, with all this glory and swag for the intrepid crusader, do you really want them to give you hint? Not I. Or 2) Nobody wants to die with a cool secret, unless the parties involved have entered a pact to never reveal said secret because of all the cool swag involved. But really, if such an easter egg exists and it's pretty clear no one is even close to finding it, Bungie will drop a hint, a very subtle or obscure hint. Even though they have handed over control of the Halo franchise, what's to keep them from dropping a hint in a future game? Therefore, be patient. All things past will probably be made known and new secrets will always lie before us. [Edited on 10.07.2012 5:03 PM PDT]