Either I have a weird memory, or this was done before. I mean, isn't level transition a common thing nowadays? Not to say I dislike this, not in the least, I'm just not seeing what's THAT special about it. :V If I recall properly, act-to-act transitions have never been done in Sonic 1 before. Ever. EVER. It's been done countless times in Sonic 2, and S3K already has 'em, but never Sonic 1. So yeah.