fixed
rotating
pen
background
Mac users: substitute ⌘ for Ctrl
| Move gear | Click and drag or , , and | 
| Move gear without drawing | Shift + click and drag or Shift + , , or | 
| Rotate gear in place | Ctrl + click and drag or , and . | 
| Undo | Ctrl + Z | 
| Redo | Ctrl + Shift + Z or Ctrl + Y | 
| Erase everything | Ctrl + Backspace | 
| Show/hide gears | G | 
| Show/hide cursor tracker | T | 
| Download image | Ctrl + S | 
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