Bonka
Open editor

Experimental toolset v0.3.0

Shape big worlds
for a small machine.

Bonka is a browser-based editor for designing isometric Game Boy Advance scenes, from the first tile to Butano-ready build inputs.

Download latest ↓Get started →

For Chromium-based desktop browsers · Open source under GPL-3.0-or-later

Isometric scenes✦Open project format✦Butano build inputs✦Game Boy Advance

The workflow

From loose pixels
to a living place.

Bonka keeps the creative loop close: compose your tiles, paint a scene, then bring clean data to your GBA build.

Import tiles

Bring in your PNG tilesets and browse a searchable palette built for small, deliberate assets.

Compose metatiles

Build reusable pieces, choose their size, and mark collision directly where it matters.

Paint a scene

Lay down isometric worlds with drag painting, layers, offsets, groups, objects, and entities.

Generate output

Turn your project into disposable Butano build inputs, ready for your GBA development workflow.

Made for making

Tools with a point
of view.

01

See the whole scene

Zoom, pan, fit-to-viewport and grid controls keep a 32 × 64 isometric canvas comfortably under your hand.

↘
02

Build with structure

Organise tiles, objects and entities into groups. Reorder, hide, offset and tune opacity without losing your place.

↘
03

Keep the experiments

Undo and redo history, keyboard commands and saved-state feedback let you push an idea without fear.

↘
04

Work in the open

Projects are clear, versionable JSON files with schemas that validate resources and their relationships.

↘

Project Format v1

Your project
stays yours.

Bonka projects are readable files, not a black box. Scenes, tilesets, metatiles, sprites and entities each live in their own JSON document, ready for source control and future tools.

Read the format specification →
bonka.config.json
{
  "formatVersion": 1,
  "name": "old_road",
  "resources": {
    "scenes": ["scenes/old_road.json"],
    "tilesets": ["tiles/forest.json"]
  }
}
Schema valid

Start building

A small tool for
your next world.

Bonka is experimental, open source, and growing in public.

Download v0.3.0 ↓Read the docs →