Soldato
Call me Bret 'The Hitman' Hart now, cos I just completed all missions
Overall easier than SSF4 challenges though, and certainly took less time to complete.
impressive. i am only 60 something percent done, but i couldnt be bothered with some of the useless but harder combos
personally i thought the timing of some advance combos (like magneto up and down combo and ironman combos) are harder than ssf4.