Brass cleaner, a microfiber cloth, and some elbow grease can fix any scratched disc. Apply liberally, rub in a circular, outward motion (against the “grain”, i.e. against the pits where the data stream is stored). Repeat until disc works again.

I had a friend who didn’t take very good care of his games. When the game would stop loading, he’d let me keep it. They always came back to life using the Brasso technique. Got to enjoy a lot of free Xbox games thanks to him. Halo 2 was an especially memorable experience. My brother and I got many years of entertainment out of that one.