1. the heretic
2. armory
3. cairo station
4. outskirts
5. metropolis
6. the arbiter
7.oracle
8. delta halo
9. regret
10. sacred icon
11. quarantine zone
12. gravemind
13. uprising
14. high charaty
15. the great jouney
Yes, there are three Easter egg levels in Halo 2
HALO Wars has the most levels. But if you're just talking about the regular first person HALOs, then HALO 2 has the most levels.
There are 15 total campaign missions.
Be player 2 in the halo 3 co-op campaign. Or, play the Arbiter levels in halo 2.
50 levels which will take the average person 12 hrs
The heretic, armory, Cairo station, outskirts, metropolis, The Arbiter, Oracle, Delta halo, Regret, Sacred Icon, Quarantine zone, The Gravemind, Uprising , High charity, The great journey. 15 in all
there are three levels in halo CE anniversary
No there is no codes but if you go to bungie.net they will give you hints and secrets of the levels.
you hav 2 complete the game
It depends on whether or not you consider the cinematics, such as "The Heretic" or "Gravemind", as "levels". If you do, then the 3rd level on Halo 2 would be "Cairo Station". If not, then "Outskirts" would be the 3rd level on Halo 2 klay world pancake mines.
about $15 dollars :) for both each
It depends on what halo your talking about Halo CE: 2001 Halo 2: 2004 Halo 3: 2007 3 years in between each game