co-op nightmare

is beating doom on nightmare difficulty with two player co-op difficult?

http://www.youtube.com/watch?v=To6nkpffDXI

Why don't you just try?

well I have done it, actually all 3 episodes but I was wondering how people would describe such a feat in terms of difficulty. would you say that it's a cake walk for example? Is doom 2 easier? etc...

I guess Doom II is harder because one has to beat only 8(9) maps in Doom I to make a successful episode run (versus Doom II's 30(32) maps).

Although I think doing 4 episodes in one run (which isn't possible in a single .LMP?) would be harder than Doom II.

I wonder if anyone has put the first 3 doom episodes together into a single .lmp file? A friend and I have been trying to fight through episodes 1-3 in a row without dying on NM skill which is very difficult! If you had all the levels together at least you could keep your equiptment, that would help make things easier.