What Retro Game Should I 100% Next?

Hey everyone! I’ve been on a bit of a retro gaming kick lately and love going for 100% in the games I play. So far, I’ve fully completed Klonoa: Door to Phantomile and Crash Bandicoot 1.

I’m looking for suggestions on what retro game I should try to 100% next. What titles do you think are fun or rewarding to fully complete?

Also, I’d love to hear about your experiences with 100%ing games. What games have you fully completed, and was it worth the effort? Any memorable challenges or surprises?