Global Defense
A landmark action game for the Sega Master System, Global Defense combines tight controls with engaging gameplay. Its enduring appeal lies in the perfect balance of challenge and reward.
- Developer
- SEGA
- Platform
- Master System
- Genre
- Action
- Players
- 1P
- Rating
- 4.2 / 5 (2.3K)
- Last updated
Global Defense Controls — Master System Keyboard Keys
Default keyboard bindings for Global Defense on our in-browser Master System emulator. Plug in a USB or Bluetooth gamepad to auto-detect mappings, or rebind any key from the emulator settings menu.
| Keyboard | Console button | Typical use |
|---|---|---|
| ↑ | D-Pad Up | Move up |
| ↓ | D-Pad Down | Move down |
| ← | D-Pad Left | Move left |
| → | D-Pad Right | Move right |
| X | 1 | Primary action (jump / confirm) |
| Z | 2 | Secondary action (attack / cancel) |
| Enter | Pause | Start / Pause |
Rebind any key from the EmulatorJS in-game settings menu (gear icon → Controls). A connected gamepad auto-maps to the same buttons.
Global Defense Longplay & Gameplay Videos
Watch a full playthrough of Global Defense on Master System before you dive in — recommended for getting a feel for the game's pacing, story beats, and difficulty curve.
Watch longplay on YouTube
"Global Defense" Master System longplay
Global Defense Cheat Codes
3 community-curated cheats for Global Defense. Tick any to activate them automatically when you click "Play with cheats" — or copy a code into your own emulator.
-
Infinite Health
00C1-3619 -
Infinite Lives
00C0-6C03 -
Infinite Weapons
C92-06E-6E2
External references
Frequently Asked Questions
Who developed Global Defense?
Global Defense was developed by SEGA, available to play in your browser on RetroGameSpace.
How many players does Global Defense support?
Global Defense is a single-player Action game for the Master System.
What type of game is Global Defense?
Global Defense is a Action game for the Master System, playable instantly in your browser — no downloads, no installs.
How can I play Global Defense for free?
Open this page and click "Play Now" — Global Defense runs free in your browser via WebAssembly emulation. No account, no payment, no installer.
Do I need to download anything to play Global Defense in the browser?
No. Global Defense streams from a public archive into a browser-side Master System emulator. Nothing is installed on your computer.
Can I save my progress in Global Defense?
Yes. Save states are stored in your browser (IndexedDB) per game, and you can also use any in-game save the original Master System cartridge supported.
Does Global Defense work on mobile devices?
Yes — the Master System emulator runs on iOS Safari and Android Chrome. Touch controls overlay the game; landscape mode is recommended.
Is it legal to play Global Defense this way?
RetroGameSpace is a transient caching reverse-proxy and does not host first-party copies of Global Defense. Game files are fetched on demand from publicly-accessible archives. You are responsible for compliance with your local laws and the bring-your-own-ROM principle.
