World at War was the toughest of them all, primarily because for some strange reason they coded the enemies to spam grenades.
While in the games before World at War you could cheese the majority of levels by sitting back and picking them off one by one, this one was totally different and had you running for different covers after every kill.
Fun, but irritating. Just checked back and I got the Veteran achievement for each Call of Duty game up to Black Ops 2.
Halo 4 Solo Legendary was a lot tougher than the Call of Duty games IMO.
Nice! Got me beat. :) I remember the first MW having the grenade spmming too though? I still say COD 3 was worse, but that's splitting hairs. They were both pigs. I have never played Halo 4 but Halo 1 legendary was hard for me. The worst part was in a hanger of sorts. Waves of enemies to the point of absurdity.
Chinese food for breakfast