Go!
Mine:
1)Halo3
2)Halo3 ODST
3)Halo Reach
4)Halo CE
5)Halo 2
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ODST Reach Halo 2 Halo 3 Halo/Halo Custom Edition* *Custom Edition was fun and I'm not sure if it could REALLY be included but its in a tie with the first Halo.