Load multiple room JSONs here. Click a room to edit it. Linking lets you pick an exit in one room and a spawn in another.

Downloads are per-room. Checked download will save one file per checked room.

Tools are on the icon toolbar at the right edge of the canvas.

Layers: every object (platforms, houses, NPCs, enemies, props, doors, exits) has a layer in its Properties — lower = further back, higher = further forward. The canvas and game draw back-to-front by (layer, category), and the select tool respects layers.

Shortcuts: Ctrl+Z undo, Ctrl+Y redo, Ctrl+C/V copy/paste, Del delete, Ctrl+D duplicate.

Load an enemy types JSON (keyed by enemy id). Built-ins (enemy/miniboss/boss) are always available; importing overrides them.

Pick which NPC the NPC Spawn tool places. You can also change an NPC's type in Properties after placing it.

Load objects.json to get default properties. Built-ins are always available: flow_butterfly (light), lamp (save point), flow_butterfly_jar (collectible), house, diary, player (size reference).

No objects loaded.

1) Select an Exit in the active room
2) Choose target room + spawn (entry spawn)
3) Click Link

Link Mode: select an Exit in the active room, then click an entry spawn marker in the compare canvas to auto-link.

Compare shows a second room canvas (read-only) to visually match door positions.

Select something to edit properties.