One of my favourite games ever
Levels ranked:
Sierra 117 - 8/10
Crow's Nest - 9/10
Tsavo's Highway - 7/10
The Storm - 9/10
Floodgate - 8/10
The Ark - 10/10
The Covenant - 10/10
Cortana - 6/10
Halo - 10/10
Amazing