After bringing in many of his own Japanese staff, Naka spearheaded the creation of a sequel while an entirely separate, Japan-based team worked on Sonic the Hedgehog CD (SEGA, 1993). However, all was not right at SEGA as Sonic mastermind Yuji Naka quit for the California-based SEGA Technical Institute. Sonic the Hedgehog was a massive success for SEGA thanks to an aggressive marketing campaign and including it with their 16-bit Mega Drive, SEGA saw sales of over 15 million copies upon its release. Story Title: “Pirates of the Mystic Cave”