Platform: Sega Master System
Region: NTSC-U
Country: United States of America
Developer(s): Sega R&D2
Publishers(s): Sega of America, Inc.
ReleaseDate: 1988-03-01
Players: 1
Co-op: No
Global Defense
Also know as: SDI
Players control a satellite and must destroy enemies by moving a crosshair over them and firing the satellite's weapons.
ESRB Rating: E - Everyone
Genre(s): Action | Shooter
