Im not Exacty sure but about round 5 million copys or something like that
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halo,halo 2,halo 3,halo3 ODST,halo wars,halo reach
There are 6 Halo games: Halo, Halo 2, Halo 3, Halo ODST (Orbital Drop Shock Trooper),halo wars, halo reach. you for get halo battle evolution
There are currently seven (7) Halo Series Video Games: Halo: Combat Evolved, Halo 2, Halo 3, Halo Wars, Halo 3: ODST, Halo: Reach, and Halo: Combat Evolved 10th Anniversary Edition. The release of Halo 4 from 343 Industries will increase the total to eight (8).
it goes halo, halo 2, halo 3, halo 3 odst and soon halo reach will be available
You can get 43 achievements offline on halo 3 im not sure on odst.