This article pertains to the beta elements of the Master System and Game Gear version of Sonic the Hedgehog.
||These unused sprites can only be found in the Master System version of Sonic the Hedgehog's Green Hill Zone. The animations go unused, but an alternative one is used in Jungle Zone instead.
||These unused Bat sprites can only be found in the Game Gear version of Sonic the Hedgehog's Green Hill Zone. It appears to be a version of the Batbrain, which appeared in the 16-bit version of the game.
One of magazines shots features the screenshot from possible, earlier build of the original Master System game with the hud spelling "RING" instead of "RINGS".
Unused Marble Zone BGM
An unused 8-bit variation of Marble Zone's background music can be found in the ROM data of the Master System version of the game.
Ancient Corp. developed the 8-bit releases of Sonic the Hedgehog, and were evidently going to credit themselves on the game's title screen with the text "©SEGA/Ancient 1991". In the end, however, only SEGA received credit.
||Sonic | Dr. Robotnik | Animals (Flicky, Pocky, Pecky, Cucky, Ricky, Picky, Rocky)
||Moto Bug | Buzz Bomber | Chopper | Crabmeat | Newtron | Caterkiller | Spikes | Burrobot | Jaws | Orbinaut (Unidasu, Uni Uni) | Bomb | Ball Hog
||Green Hill Zone | Bridge Zone | Jungle Zone | Labyrinth Zone | Scrap Brain Zone | Sky Base Zone | Special Stages
||Spin Attack | Spin Jump
||Ring | Video monitor (Super Ring, Shield, Power Sneakers, Invincible, Extra Life, Continue Monitor, Arrow Monitor) | Spring | Bumper | Switch | Air Bubble | Signpost | Capsule
||Bomb | Chaos Emerald | Conveyor Belt | Continue | Crusher | Electric Generator | Fire Statue | Flipper | Giant spear | Iron ball | Seesaw | South Island | Spikes | Teleporter | Totem pole