| Aka: | SDI |
| Console: | Sega Master System |
| TV Standard: | NTSC-U |
| Country: | United States of America |
| Developer(s): | Sega R&D2 |
| Publisher(s): | Sega of America, Inc. |
| Release Date: | 1988-03-01 |
| Players: | 1 |
| Co-op: | No |
| ESRB: | E - Everyone |
| Type: | Action, Shooter |
Players control a satellite and must destroy enemies by moving a crosshair over them and firing the satellite's weapons.
Game Player of Global Defense on Sega Master SystemGenerally, you can review the controls (keyboard) setting during each game in the screen before it starts. Use the arrow keys and “Z”, “X”, “A”, “S”, “Q”, “E” buttons to play, or customize yourself with your gamepad or keyboard.
| Keyboard | Controls |
| ← → ↑ ↓ | Directions for LEFT, RIGHT, UP, DOWN |
| Enter ↵ | START |
| Shift | SELECT |
| Z | A |
| X | B |
| A | X |
| S | Y |
| Q | L |
| E | R |
