Secret Levels

Hi All,

I finished both MP1 & 2 and I've done this twice with both, now comes the part where I'm looking for those secret levels, I know about the one in the MP1 tutorial, could anyone share any others they might have found? I have also done the one at the end of MP1 when you finish all the difficulty levels and you get that stage where the "agents" run in from the sides infront of you....

Thanks ppl.
Absolute