Delta Halo on Halo 2 is practically unbeatable on Legendary mode due to crashes, unless you use the original graphics. The big was reported to 343 years ago, I think back when MCC was still an Xbox exclusive, and they still haven't fixed it. And they don't give you any warning about it, you only figure it out after the game crashes halfway through the level for the 5th time and you decide to start Googling it.