Game Description:This Sega Ages title features two Sega System 16 arcade classics, SDI and Quartet, in all their forms. The package starts with the original arcade entries, SDI (1987) and Quartet (1986). Sega has included all three arcade updates of SDI and even Quartet 2, a 1986 table version of the arcade game designed for two players. The Master System (Mark III) versions of the games are included in the package as well: SDI (1987) and Double Quartet (1987). Sega even went so far as to include the US versions of the Master System titles, known in America as Global Defense and Quartet, and featuring some graphical and character changes. All of this is topped off with a replay video of SDI, a gallery mode featuring pamphlets from the time, an instruction manual with developer and fan commentary and support for the mouse and multitap.