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The "0413" build of Sonic Spinball is a prototype build of Sonic Spinball for the Sega Game Gear. It was released by drx during the February 23rd, 2008 proto release.
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- Rolling Sonic finally makes his appearance on the Sega Logo, but he inverts the color of the logo.
- 1994 Sega copyright appears on the Title Screen.
- Levels can be skipped by pressing or while the game is paused. You can also press to move Sonic anywhere.
- The continue screen when you run out of lives is the same as final.