Sonic 3 Hadouken is a ROM hack of Sonic the Hedgehog 3 for the Sega Genesis. The addition of 'Hadouken' to the title suggests the incorporation of the famous projectile attack from Street Fighter. This modification by the ROM hacking community introduces new gameplay mechanics to the original Sega release. The core platforming mechanics remain, however, with the addition of this iconic special move. 

Sonic 3 Hadouken

Sonic 3 Dark Sonic