Tip: Make sure that ALL exit-enabled pipes, doors, etc. have a screen exit defined, or they'll take you to Level 0, the "endless" bonus game. Unless Start+Select is enabled, the only way out of it is to reset the game.
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Details for Sonic 3D Blast (Genesis) - Gene Gadget Zone Act 1
SMW Music - Sonic 3D Blast (Genesis) - Gene Gadget Zone Act 1