Drag to paint · right-click erases · Ctrl+Z / Ctrl+Shift+Z undo/redo. Each hole needs one Start and one Hole.
This hole
Typical player (numbers = shots)
Best possible line
Everything here changes only this hole. Ctrl+Z undoes it.
Saved in this browser
Saved by name, only in this browser (not online, not on other devices). Separately, whatever's on screen autosaves and comes back when you reopen the editor.
Ready.