More browsing paths
Play Castelian (Beta · US edition) Online
Castelian
This is a pre-release edition. Play Castelian online for Game Boy. Julius must climb eight cylindrical towers and place a demolition bomb at each summit.
Browser play

Game Boy (GB) — EmulatorJS controls
Default Player 1 keyboard mapping. Change keys in Controller Settings.
| Console button | Keyboard |
|---|---|
| ↑ / ↓ / ← / → | ↑ / ↓ / ← / → |
| A / B | Z / X |
| START / SELECT | Enter / V |
Open Controller Settings to configure your keyboard or gamepad. Touch controls are available on mobile.
How to Play Castelian
Quick start
Press START and walk around the first tower to inspect its ledges. Stop before pressing A to test a shot; move while pressing A to jump. Use Up at a doorway or elevator and step off a lift promptly at the destination.
Controls
Left/right: walk around tower. Up: doors or elevator ascent. Down: elevator descent. A: shoot while standing, jump while moving. B: unused. START: pause. SELECT before play changes audio options.
Castelian — About this game
This is a pre-release edition. Julius must climb eight cylindrical towers and place a demolition bomb at each summit. Walking rotates the visible tower surface, revealing ledges, doorways and elevators on its far side. The action button fires a Carbonobomb while standing but becomes a jump while moving. Crumbling paths, returning lifts and patrolling enemies make the order and timing of the ascent as important as reaching the highest platform. Press START and walk around the first tower to inspect its ledges. Stop before pressing A to test a shot; move while pressing A to jump. Use Up at a doorway or elevator and step off a lift promptly at the destination.
Castelian Game manuals
Cheats
No cheats have been added for this edition.
Player verification and sources
Browser play was reviewed before this edition was published in the catalogue. The date below is the catalogue publication date, not the game’s original release date.
- Browser test and catalogue publication date
- Browsers and devices
- PC: Chrome, Edge and Firefox. Mobile: Chrome on Android and Safari on iPhone and iPad.
- Player engine and core
- EmulatorJS 4.3.0-pre · gb
- Tested by
- rwEmulator
Sources and editorial basis
rwEmulator reviews edition metadata, release information, game manuals and first-hand browser-play notes. Available manuals are linked below; the editorial policy explains how facts are checked and corrections are handled.