Sonic the Hedgehog Vol.2 is another fan-made ROM hack for the NES, again based on Super Mario Bros. but heavily modified to include Sonic the Hedgehog elements. This ROM hack likely expands on the previous version, featuring more Sonic-themed levels, characters, or gameplay mechanics. As it is a fan creation, it does not have any official association with Sega or Nintendo.

Sonic the Hedgehog Vol.2

Sonic 3D Blast 6