Islands
Seeded island/terrain simulation with overlays and keyboard controls.
MAINTAINED
webapp
Updated February 12, 2026
What it does
Islands is an interactive island/terrain sim. It generates a world from a seed, then lets you step the simulation forward and inspect the terrain.
How to use it
- Open: islands.tedt.org
- Set a seed and click Apply (or use
?seed=...in the URL) - Use the built-in keyboard shortcuts to step, pause, and toggle overlays
Notes
- Tip from the app: pressing any key stops the initial auto-run. Press/click R to restart.
Details
Tech
- JavaScript
- HTML
- Canvas
Tags
procedural
terrain
simulation
canvas
javascript
tools
Features
- Seeded generation (shareable via ?seed=…)
- Keyboard-driven stepping and speed controls
- Overlays for terrain/coastlines/rivers
- Hover readouts for cell + elevation