Hi,

I noticed that the undo button only goes back a limited number of steps.

As an alternative, would it be possible to allow the deletion of cells of a specific color (there are 3 of them to choose from). Often I change colors to explore a route, but without the undo, I am stuck deleting them one cell at a time - while I can drag to fill them in, it doesn't seem to work on the delete, so it is quite laborious!

Thanks, Raphael