Fantasy Zone Classic
Sega Master System · Shoot 'em Up / Action
SDI
Deep cut
| System | Sega Master System |
|---|---|
| Genre | Shoot 'em Up, Action |
| Developer | SEGA |
| Publisher | SEGA |
| Players | 1 player |
| Commitment | Quick session (Under an hour, or endless arcade fun) |
| Legacy | Deep cut · legacy score 3 |
SDI is a shoot 'em up released for the Sega Master System, developed by SEGA. Depending on the region, you may also know it as Global Defense. It blends shoot 'em up and action elements.
Among the 31 Master System shoot 'em ups in our database, it ranks #24 by legacy score.
SEGA also made Alex Kidd in Miracle World, Phantasy Star and Hang-On for the Master System.
SDI is a single-player game, so it's one to enjoy at your own pace.
Pick it if…
- you want to fight, blast and test your reflexes
- you have time for a quick session (under an hour, or endless arcade fun)
- you've played the Master System hits and want something less obvious
Maybe skip it if…
- you dislike high difficulty and screens full of bullets
- you are looking for something to play with friends
What playing SDI is like
Shoot 'em ups (shmups) put you in a ship facing waves of enemies and bullets. Runs are short and intense, and the goal is to survive, collect power-ups and push your high score.
Tip for newcomers: Focus on your ship's small hitbox rather than the flood of bullets, and learn which power-ups suit each stage. Most shmups are designed to be replayed many times.
SDI cheats & codes
3 codes on file (Action Replay, Other codes). Here are a few Action Replay codes to start with:
| Infinite Health | 00C1-3619 |
|---|---|
| Infinite Lives | 00C0-6C03 |
SDI walkthroughs & guides
Stuck, or want to go deeper? These trusted sites have full walkthroughs, completion times and more for SDI.
If you like SDI, the Matrix also picks…
Playing Master System games today
The Master System library is full of colorful arcade-style games that are easy to pick up. Many titles also appear in Sega's official compilations.
SDI FAQ
Who made SDI?
It was developed by SEGA.
Is SDI multiplayer?
No. SDI is a single-player game.
How long does SDI take to play?
As a shoot 'em up, SDI typically falls into the "Quick session" category: under an hour, or endless arcade fun. Your time will vary with skill and how much you explore.
Read more about SDI on Wikipedia. Facts on this page are compiled from the open libretro database and Wikidata; "legacy score" reflects how widely a game is documented across Wikipedia's language editions. Spotted an error? Let us know.