i think all buttons light all the time , there's a youtube video with someone playing a slant top of Kingpin and thats what it looks like happens you need to watch the screen to tell you what you are betting. this is the newest slot i own and i dont really gamble but do go to the casinos alot with my sister (the gambler) and i thought the button lit only when pressed for your bet but maybe that came later as slot machines evolved, its funny the times buttons say 1 2 10 15 20 but on the screen it will say 1 2 3 4 5 times which sounds right to me so i might need to change the button labels if i can find them.