Screenshots1 / 2
Zillion
Zillion is a side-scrolling action game developed by SEGA in 1987 for the Master System. Players control a special agent infiltrating an alien base on a mission to destroy it from within. The game blends platforming and shooting mechanics, requiring players to navigate complex levels while eliminating enemies and obstacles. The protagonist carries an upgradeable gun that gains new capabilities throughout the game. Each level is constrained by a time limit, creating urgency during missions. Level design features multiple pathways and varied enemy placements that encourage exploration and strategic thinking. Zillion's gameplay relies on its pacing and the tactical progression enabled by weapon upgrades rather than relying on difficulty spikes.
- Developer
- SEGA
- Platform
- Master System
- Genre
- Action
- Players
- 1P
- Rating
- 4.9 / 5 (1.2K)
- Last updated
Zillion Controls — Master System Keyboard Keys
Default keyboard bindings for Zillion 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.
Zillion Longplay & Gameplay Videos
Watch a full playthrough of Zillion 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
"Zillion" Master System longplay
Zillion Cheat Codes
12 community-curated cheats for Zillion. Tick any to activate them automatically when you click "Play with cheats" — or copy a code into your own emulator.
-
Life On Status Screen
00C1-5399 -
Infinite ID Cards
00C1-2905 -
Red ID Card
00C1-2A01 -
Floppy Disks
00C1-2B05 -
Zillion Power At Maximum
00C1-4602 -
Player Level Modifier
00C1-450000C1-450? -
Jumping Ability Modifier
00C1-470000C1-470? -
Scope
00C1-4801 -
Infinite Energy
1A0-3AC-A22+1A0-6BC-A22+1AF-FCD-A2200C1-43701A0-45C-A22+1A0-83C-A22+1A0-B4C-A22 -
Infinite Time at the End
00C6-7756 -
Infinite Health
00C1-4399 -
Infinite Continues
00C1-1204B64-DAD-3BEB65-23D-3BE
External references
Frequently Asked Questions
Who developed Zillion?
Zillion was developed by SEGA, available to play in your browser on RetroGameSpace.
How many players does Zillion support?
Zillion is a single-player Action game for the Master System.
What type of game is Zillion?
Zillion is a Action game for the Master System, playable instantly in your browser — no downloads, no installs.
How can I play Zillion for free?
Open this page and click "Play Now" — Zillion runs free in your browser via WebAssembly emulation. No account, no payment, no installer.
Do I need to download anything to play Zillion in the browser?
No. Zillion streams from a public archive into a browser-side Master System emulator. Nothing is installed on your computer.
Can I save my progress in Zillion?
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 Zillion 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 Zillion this way?
RetroGameSpace is a transient caching reverse-proxy and does not host first-party copies of Zillion. 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.
