Sega Ages 2500 Series Vol. 21: SDI & Quartet: Sega System 16 Collection

This game is a compilation, as the name suggests, comprising the SDI: Strategic Defense Initiative and Quartet video games adapted for the Sega Master System and the Sega System 16 (in Japan and elsewhere globally). In the case of SDI, this is the first time the game has been introduced to the home with the appropriate control scheme for using two joysticks simultaneously.