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The layout for this zone is much unlike compared to the final version.
The most unique elements in this prototype level are wooden balls that were
released from the ground if a switch is pressed. The ball doesn't hurt
Sonic. In fact, Sonic can have a ride by standing on it. The velocity of the
ball is fixed and Sonic cannot stop or push the ball.
A bigger version of the ball is also available in Sonic 1 Green Hill
Zone. It's visible in debug mode, but you cannot place the object and see
what it does.

Ball appears in Sonic 1 debug mode. |

Ball is active in Sonic 1 prototype. |
Oil Ocean Zone plays music #81 in the prototype, or equivalently #08 in
the final.

Push the button, and the ball comes out and rolls to the right. |

The bouncing platform is missing the flames and spikes. |

Missing oil splashing animation. For some strange reasons, Sonic can
sometimes walk on thin air. In addition, the pipe in the background is
sucking oil up. |

Oil slides don't do anything to Sonic. |
Continue on Oil Ocean Zone -> |