Nsanity on 26 November 2012
Via NeoGaf:
Halo 3
W2 -79%
Halo Reach
W2 -80%
W3 -45%
W4 -43%
W5 -37%
Halo 4
W2 N/A
W3 -26%
Week 1:
Halo Reach = Halo 3 + 20k
Halo 4 < Halo 3