- Back to: Sonic the Hedgehog (16-bit).
On a Japanese system, the ™ symbol on the Sega logo is removed.
The ™ is also removed from the title screen.
The level select has been rearranged to list to final Zone order.
Clouds in Green Hill Zone now scroll to the left automatically.
New layers of parallax scrolling have been added to Marble Zone's background.
Blocks that land in lava now bob up and down in REV01. There is a suggestion this was always the intended behaviour, as this motion occurs in prototype versions of the game.
Parallax scrolling has also been added to Spring Yard Zone's background. Previously it was entirely static.
A ripple effect has been added to the background when underwater in Labyrinth Zone and Scrap Brain Zone Act 3.
There is an obscure shortcut in Labyrinth Zone Act 1; if Sonic presses the left button in the second underwater section (the one with the two rising platforms), a secret moving platform will spawn above. If the player can backtrack up to the surface, the top path of the level can be accessed.
It is on this route that REV01 adds an extra Ring, making it possible to collect 50 Rings and access the Special Stage while taking this shortcut.
Scrap Brain Zone Act 1 also gets parallax scrolling.