This prototype of Sonic the Hedgehog 2, developed by Simon Wai, likely presents a unique version with alterations or additions specific to this developer's work. The involvement of a specific developer often leads to different approaches or design choices in game mechanics, level structure, or other aspects.  Analyzing this prototype offers a window into the individual contributions and creative differences within the development team.

Sonic the Hedgehog 2 (Simon Wai prototype)

Sonic the Hedgehog 2 (colourised ending hack)