Why can't I play all championships in WWF No Mercy for the Nintendo 64?

PRobably because they aren’t unlocked, every other game does that when something is locked.

Na, cause I used to be able to play them. Plus how would I unlock them?

Beats me, maybe check gaming forums.

I tried. lol I feel like they used to be available but aren’t anymore.

Wierd, I’d say reset the cartridge or save or whatever system it uses to track progress, if possible copy it (like you can with a gamecube)

I don’t think I can do that because it saves everything to the cartridge, and I don’t want to loose my progress that I made over 10 years ago. lol I do appreciate the suggestions though.

Wierd, maybe try on another console or something.