In the crossword game code attached we need the Undo button to function like a backspace button where it just removes the last entered letter instead of resetting everything -- 2

Hi! I don't see no game attached. Please forward the code for a close-up examination. Also as the tatile 'Undo' on the button would be ambiguos in the face of how it would now act, maybe it's a good idea to name it 'Undo All' and add anoter one named 'Undo Last'(if there's visually space to fit it in) to spare the visitor scratching their heads? Kind Regards, Dobri