Controls
Left mouse or one finger: draw / erase / move with the active tool
Mouse wheel or two-finger pinch: zoom
Space + drag, middle mouse, two-finger drag, or touch-and-hold: pan
Ctrl + Z undoes and Ctrl + Y redoes your latest local actions only. Remote collaboration operations are applied in deterministic server opSeq order; out-of-order remote ops are buffered until missing sequence gaps arrive. If concurrent remote edits arrive after your local history diverges, undo/redo history is cleared and you'll see a non-blocking notice. Delete key removes the selected hand-tool object. Refreshing the page reloads the most recently updated project.