The Genesis initally competed against the 8-bit Nintendo system (also known as the Famicom), but although it had superior graphics and sound, had a hard time overcoming Nintendo's ubiquitous presence in the consumer's home. Sega of America competed by focusing on a slightly older user base, with such titles as Altered Beast[?] and the Phantasy Star series.
Two add-on components were later designed to enhance the system: the Sega 32X and the Sega CD. There was also a redesign of the Genesis console itself the Sega Genesis 2, which reduced cost and size by consolidating chips, and integrated stronger region encoding (which broke compatibility with some older games.) The original console itself went through innumerable revisions, unknown to most users save the ones who owned one of the very first consoles, which had trouble playing a few of the newer games. A portable version of the system called the Sega Nomad was released probably too late to ever be successful, though it played the same cartridges as the home console (with some notable incompatibilities.) Sega's successor to the Mega Drive was the Saturn.
The Sega Genesis enjoyed considerably more popularity in its native country Japan, and in many parts of Europe was much more popular than the Super Nintendo .