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

Another emulated re-release for SEGA's AGES 2500 series. This time including two arcade hits from its System 16 boards: SDI and Quartet. SDI is a Missile Command clone in which you play a global defense satellite in charge of defending earth by shooting down incoming missiles. Both the original arcade version as well as the SMS port are emulated, and mouse support is included in the arcade version. Quartet is a sci-fi sidescrolling shooter that differentiated itself from its competition by including simultaneous four-player support (hence the title). As with SCI, both the arcade original and SMS ports are included, as well as a version of the arcade-only Quartet 2. It also includes an online gallery of arcade leaflets and ads, as well as printed reproductions of select promotional material.