Sonic Unreal World v1.4 is a fan-made game or ROM hack, likely based on the original Sonic game engine. Version 1.4 implies iterative development with bug fixes and possible added content since the initial release.  The 'Unreal World' suggests the game might feature a unique or unconventional setting compared to the original Sonic games. Sega is not involved in the creation or distribution of this fan-made game. It shows the community's creativity and dedication to extending the legacy of a classic game franchise.

Sonic Unreal World v1.4

Sonic UMGZ