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

Somari

Son Son (Japan)

Sonic 3D Blast 5 (Unl)

Sonic 3D Blast 6

Sonic in SMB1 v2.5

Sore Ike! Anapanman - Minna de Hiking Game! (Japan)

Souseiki Fammy - ROM-QD for 256K+64K (Japan) (Unl)

Space Harrier (Japan)

Space Hunter (Japan)

Space Invaders (Japan)

Space Shadow (Japan)

Space Shuttle Project (USA)