Sonic & Tails

In the US version of the game, the Gigalopolis Zone was changed to the Gigapolis Zone. This could be due to the fact that some children might read the name as "GIGOLOpolis." However, it's odd that the Master System version also calls this level Gigalopolis so the name might be changed due to a different font used in the US/European Game Gear version compared to other versions.

"AND YOU." i.e. the game player, under "THANKS TO" in the end credits after the game is completed.

The Master System version that was sold in Europe and Latin America is quite different to the Game Gear versions. The Introduction and Gigalopolis Zone have completely different music, while most music in the stages have different arrangements (except Mecha Green Hill Zone and Electric Egg Zone). The Player Select uses the character sprites instead of a portrait of Sonic or Tails and the title screen just has a blue background. There is more range of view in the levels, like Sonic the Hedgehog 2 (1992/II) which makes the game slightly easier. Also at the end of level tally it says Continue instead of Conti'.

Featured in Outside Xtra: What Is Sonic's Top Speed? - We Used Sonic Colours Ultimate to Find Sonic's Max Speed (Sponsored) (2021)