Halo 4 was a breeze for me, even on legendary.
Check out my new poll about legendary missions: https://www.bungie.net/en/Forum/Post/110615372/0/0
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(Hardest to easiest) ODST Halo 2 Halo Reach Halo CE Halo 3 Halo 4 That being said, the hardest level that I've ever played was Cortana in Halo 3. Spent a good 5 hours on it.