Screenshots
HAL21
HAL21 is an arcade action game released by SNK in 1985. Players control a spacecraft navigating through enemy-filled stages, shooting down waves of hostile ships and obstacles. The game follows a vertical or fixed-screen shooter structure where the player must survive increasingly aggressive enemy formations. Using a joystick to maneuver and a fire button to shoot, players must dodge incoming fire while clearing enemies from each stage. HAL21 features multiple levels with escalating difficulty, requiring quick reflexes and positioning to progress. The game fits within SNK's catalog of arcade shooters from the mid-1980s, offering straightforward shoot-em-up mechanics typical of the era.
- Developer
- SNK
- Released
- 1985
- Platform
- Arcade
- Genre
- Action
- Rating
- 4.8 / 5 (4.2K)
- Last updated
HAL21 Controls — Arcade Keyboard Keys
Default keyboard bindings for HAL21 on our in-browser Arcade 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 |
|---|---|---|
| ↑ | Joystick Up | Move up |
| ↓ | Joystick Down | Move down |
| ← | Joystick Left | Move left |
| → | Joystick Right | Move right |
| X | Button 1 | Primary action (jump / confirm) |
| Z | Button 2 | Secondary action (attack / cancel) |
| S | Button 3 | Tertiary action |
| A | Button 4 | Quaternary action |
| Q | Button 5 | Fifth button |
| W | Button 6 | Sixth button |
| 5 | Insert Coin | Insert coin |
| 1 | 1P Start | Start / Pause |
Coin and Start are convention "Insert Coin: 5" and "1P Start: 1". Some arcade boards expect specific button mappings — check the in-game prompts on coin-up.
Rebind any key from the EmulatorJS in-game settings menu (gear icon → Controls). A connected gamepad auto-maps to the same buttons.
HAL21 Longplay & Gameplay Videos
Watch a full playthrough of HAL21 on Arcade before you dive in — recommended for getting a feel for the game's pacing, story beats, and difficulty curve.
Watch longplay on YouTube
"HAL21" Arcade longplay 1985
External references
Frequently Asked Questions
When was HAL21 released?
HAL21 was released in 1985 for the Arcade.
Who developed HAL21?
HAL21 was developed by SNK, available to play in your browser on RetroGameSpace.
What type of game is HAL21?
HAL21 is a Action game for the Arcade, playable instantly in your browser — no downloads, no installs.
How can I play HAL21 for free?
Open this page and click "Play Now" — HAL21 runs free in your browser via WebAssembly emulation. No account, no payment, no installer.
Do I need to download anything to play HAL21 in the browser?
No. HAL21 streams from a public archive into a browser-side Arcade emulator. Nothing is installed on your computer.
Can I save my progress in HAL21?
Yes. Save states are stored in your browser (IndexedDB) per game, and you can also use any in-game save the original Arcade cartridge supported.
Does HAL21 work on mobile devices?
Yes — the Arcade emulator runs on iOS Safari and Android Chrome. Touch controls overlay the game; landscape mode is recommended.
Is it legal to play HAL21 this way?
RetroGameSpace is a transient caching reverse-proxy and does not host first-party copies of HAL21. 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.
