Sega Mega-CD 32X
From Sega Retro
The Sega Mega Drive received two add-on hardware upgrades during its life time: The Sega Mega CD and Sega 32X. Five games were released that require both add-on units in order to be played. All of these titles are full motion video based games, that were previously available as standalone Mega CD games, which later had their FMV assets upgraded to take advantage of the 32X's improved graphics.