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Sega Classics Arcade Collection (セガクラシック) is a compilation of four (or five) Sega Mega Drive games for the Sega Mega-CD. It was a pack-in game bundled with launch Mega-CDs in the United Kingdom and North America, and was released separately in other regions.
Each game is mostly identical to their Mega Drive counterparts, though have minor changes thanks to the Mega-CD's enhancements. All digitised speech samples have been replaced with higher quality audio, the first level in Golden Axe uses different instruments and Super Monaco GP has extra drums. The Revenge of Shinobi is based on a later version than its cartridge counterparts, altering some of the bosses which infringe copyrights. For unknown reasons, Golden Axe is only a one-player game in this compilation.
Despite being the Mega-CD's selling point, only two games have an updated CD soundtrack (Golden Axe in the form of music recorded from its arcade board, and Columns which has a new title theme). This means only a small fraction of the disc is used.