sonic 1 has the biggest improvement, with the drop dash speeding up the slower level design
sonic 2 has the biggest downgrade, with tails jumping being all you’ll hear past the first zone
sonic 3 is basically unchanged and a fine way to play the best game of the trilogy. shame about the music though
sonic cd is still designed by a pack of chimps
none of this matters though when considering this rushed collection of ports has been given a 40 dollar price tag
buy it if you like sonic, emulate it if you are normal