I'll vote for an audio cue as well. And ideally, the counter would show in the browser tab, so that when I'm looking at other things while waiting, I can just g

I'll vote for an audio cue as well. And ideally, the counter would show in the browser tab, so that when I'm looking at other things while waiting, I can just glance and see how long I have left before I need to input anything. Excellent game.