1988 Mega Drive games

As the Sega Mega Drive launched in late 1988 only in Japan (with other regions geting it the following year), only its two launch titles — Space Harrier II and Super Thunder Blade — and two other titles, Altered Beast and Osomatsu-kun Hachamecha Gekijou, were released in 1988. Sega may also have released a home port of its version of Tetris, however due to the Tetris rightsholding group only granting that ability to Nintendo at the time, Sega quickly pulled it from manufacturing and now denies its existence on its archive page, though a few carts did wind up on store shelves.