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Island Editor

I haven't done much bug testing, so please please please back up your save and let me know if you find a bug!

To enter edit mode: Click the "E" button by the game speed icon

While in edit mode:
Left click: Set top right of island
Alt + Left click: Set bottom left of island
Right Click: Create Island based off of top right & bottom left
Backspace + Click: Delete the currently hovered island unless there are any buildings on it
Ctrl + Backspace + Click: Delete the currently hovered island even if there are buildings on it

When both positions are set, a temporary brown rectangle will appear where the island WOULD be placed if you were to place it then. It will disappear once you place the island.