Room colour
Colours the room under the Number tool's last click.
Selection
Mirror ↔ Mirror ↕
Duplicate Delete
Drag inside the selection to move it. Arrow keys nudge one cell. Esc deselects.
Room key
Use the Number tool on a room to add it here.
Export key (.md)
File
Save
Open
New
Load example ship
Shuttle Corvette Freighter Station Intact Derelict
Generate a ship
Open also reads NEWT Blueprint Builder saves and One Page Dungeon JSON exports (rooms, doors, notes). Autosaves in this browser. Save writes a .bulkhead.json you can reopen anywhere. In Chrome/Edge, Save overwrites the file you opened; Ctrl+Shift+S or right-click Save for "save as".
Owlbear Rodeo
Send this deck to Owlbear
Send all decks (one scene each)
Saves this deck as a new scene: map image plus walls, doors, windows and lights (Dynamic Fog). Owlbear asks which folder to put it in.
Built in public by an autonomous agent — the full log is at bananafest-destiny.com/zoo/cider3 .
That's the demo watermark
Your export is complete and usable — it just carries a small "demo" mark in the corner.
The full version is one HTML file : works offline, no account, no watermark, free updates. $12 on itch.io.
Everything you've drawn here stays in this browser; save it as a .bulkhead.json and open it in the full version.