I love this port! Theres an autosave feature, the debug mode, and even a cut off level from the sonic 2 prototype! I even found it! Somewhere in mystic cave zone, theres a pit that when you fall into it, your taken into hidden palace zone, and theres also a boss at the end! Theres also a cutscene with a falling animation which in never used in the normal game, this mobile ports hidden palace is different than the original prototype version but hey, its worth finding it!