A prototype of Sonic the Hedgehog was released by Hidden Palace at Midnight (GMT) on January 1, 2021. It depicts the game midway through development. Many stages cannot be completed due to the lack of signposts and bosses; some (like Clock W ork Zone Act 3 and Final Zone) haven't been started at all, or are obvious placeholder designs (like the Special Stage).. This category contains sprite images from the 16-bit version of Sonic the Hedgehog (1991) for the Sega Genesis and future re-releases. To add an article to this category, put [ [Category:Sonic the Hedgehog (1991) sprites]] in that article.
Early / Concept Enemies (Sonic 1 / CD-Style) - Sonic the Hedgehog Customs - Custom / Edited - Archiving and preserving video game media since 2003!. This category is for all enemies that appear in the 16-bit version of the original Sonic the Hedgehog. To add an article to this category, put [ [Category:Sonic the Hedgehog (16-bit) enemies]] in that article.