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The "031094" 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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- Can crash on Sega screen.
- The Sega screen has the extra text *_=Beta=_* 022894. 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.
- Options screen cannot be accessed.
- No flashing on the title card text.
- No pause text or point display while paused.
- Levels can be skipped by pressing or while the game is paused. You can also press to move Sonic anywhere.
- Explosions when destroying enemies display garbage tiles instead.
- There is a texture in the background near the first paddles in Toxic Pools, where there isn't one in the final.
- When you run out of lives you get the ending. There are sprites of Sonic and Robotnik falling down it. Robotnik humurously spins out of control. This leads to a cutscene where both characters land in a volcano.