You go to "redeem code"...
if you buy the halo wars LCE you get a code for the new mythic map pack on Halo 3
the code is 17489460
Mythic map pack mythic mature pack
No. You either need to purchase it from the marketplace, or you can get the mythic disk when you buy Halo 3: ODST.
Well you had to buy the limited adittion first of all. Next there is something with a code on it.
You have to download it over xbox live
There are 13 campaign skulls ( 9 gold ones which unlock achievements and 4 silver ones which make the game more fun ) and 6 mythic skulls ( 3 for the halo 3 mythic pack and 3 more for the halo 3 odst mythic pack )
archon armor
its going to come out with halo:ODST
800
they come out with the halo 3 O.D.S.T game
Assuming your talking about the Halo 3 mythic map pack (who knows there might be something named that for some unheard of game) you can't get a code to download it, you have to purchase Microsoft points so that you can download it, maybe you can get someone to email you a Microsoft points code and redeem that.