When the zombies arrive-i'll be there to pick up the pieces.
Winner of the Xforgery Haloween competition 2009
I did it on legendary, and Arcadia was a -blam!-, but it IS possible. Move quick, grab sniper towers, use spartans carefully and focus on taking out isolated squads. Then try to get some anti air up and running.
Scarab was a pain, and Dome. Dome was the hardest for me, until i realised i was being stupid and missed the best strategy for the level.