Somebody on another forum started this topic, I thought it would be interesting to discuss here as well. Games you used to have, but for some reason no longer do, and wish you did.
Personally, I used to have a nearly-complete Mega Man collection for the NES and SNES, but sold all of them except for MM3 and MMX1. Those are the games I most want back.
Also, Hook on the Sega CD. I'm honestly thinking of getting a new Sega CD just for this game (yes I know the SNES and Genesis versions are similar, but I liked this one the best).
So what are some of yours?