Sonic the Hedgehog ZX is a fan-made game that likely builds upon the original Sonic the Hedgehog. The 'ZX' in the title may indicate a connection to other fan-made games or be simply a stylistic choice. The game probably utilizes the standard Sonic gameplay but incorporates alterations in level design, enemy placement, or additional abilities. It is not connected to the official Sonic franchise and is a fan-made creation.

Sonic the Hedgehog ZX

Sonic the Hedgehog ReOne