Wonder Library

Wonder Library is a very rare Mega Drive cartridge which shipped with some variants of the Japanese Wondermega. When hooked up to a Mega Drive connected to the Sega Mega-CD (or a Wondermega), a specific but presently unknown (possibly Sony-made, JVC-made) type of book-on-CD can be played. As with other Wondermega-related products, the cartridge features Wonder Dog heavily.