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Secret Plant Zone is the second Zone of Sonic Pocket Adventure.
It greatly resembles Chemical Plant Zone from Sonic the Hedgehog 2, with several gameplay and visual tweaks to match the limitations of the Neo Geo Pocket Color. The infamous Mega Mack is also present in the second Act, albeit very shallow in comparison to its original appearance. A completely new boss awaits the player at the end of the stage.
The music used in the first Act is from Angel Island Zone Act 2, and the music in the second Act is from Hydrocity Zone Act 2.