Halo 2 > Halo 3 > Halo 3 ODST > Halo Reach > Halo CE
Based on campaigns.
Every Halo 2 level excluding Scared Icon, Quarantine Zone and the Great Journey
Every Halo 3 mission apart from Tsavo Highway
Tayari Plaza and Coastal Highway
Winter Contingency, Sword Base, The Package, Pillar of Autumn