H5 - isn’t difficult compared to the others. I've learned I can breeze through the campaign with the 4 skulls I’ve found: Blind, Fog, IWHBYD, and Grunt Birthday Party.
H4 - I have finished the campaign, but it was last year and I don’t remember
H3 - Same reason as Halo 4
Halo Reach - I’ve done it multiple times and the only thing that got on my nerves was the number of brutes I had to deal with in certain areas
Halo 3: ODST - Not being a Spartan didn’t affect me that much, besides having lower health 90% of the time. I almost forgot about the Jackals with carbines that love to chill on the roof of the buildings
Halo 2 - Haven’t gotten to it yet (plz don’t kill me) because I’ve been trying to get 50 hours of Custom games in H5 and I’m at 48 hours
Halo CE - Haven't completed it yet, though I did complete a level without jumping and got a new banner on MCC