As you can see from the video, just doing the beat on your own doesn't play the sound. The Google Slides will have a beat for the song as back up if you need it.

Look Up, Look Down can go on for as long, or short, as you choose. The goal is to play enough rounds to get to the final round - where each direction is opposite (up = down, down = up, right = left, left = right). This video goes through a couple of rounds, but not all.