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Sonic Spinball prototype 0405 for the Game Gear was released by drx during the February 23rd, 2008 proto release.
- The Sega screen no longer has any extra text. Also there is no rolling Sonic in the intro. The logo has a wave effect and has no flashing palette.
- Title Screen has no Copyright.
- The title card is the same as final.
- Levels can be skipped by pressing or while the game is paused. You can also press to move Sonic anywhere.
- When you run out of lives you get a Continue screen with a Yes or no option. There is no Sonic sprite present however.