Depends on what you want to do. Right now you haven't fed in any instructions on what it should do when a button is pressed. So if I were SmileBasic and you pressed A, I would read your line 9 then go to line 25 and 26, which tells me to go back to line 3 where your loop is. I'd be doing 9->25->26->3->9->25->26->9... infinitely WITHOUT showing any work. The result is nothing but a blank screen.