Saw this on YouTube a few days ago, and it's pretty damn cool! Somebody named Riftley made a mash-up of every single Halo game into a well-done mixture of classic and modern. Obviously there are some rough patches(the Halo 3 ending was definitely rushed), but considering what they had to work with...it still sounds great! Some pieces match together perfectly(the Halo Wars 2 and ODST pairing gave me chills)! This kinda reminds me of my own(shitty)mash-up attempt I did a long time ago. It's great to see this kind of dedication work so well. Hit the link for this impressive trip down memory lane!