Set your Spotify CLIENT_ID at the top of the script in index.html, then reload.

Guess the track from a sliver of sound. Fewer seconds, more points.
Sign in with Spotify Premium to play — you'll hear the whole song at the end.

Press play to hear the opening of a mystery track — just half a second at first. Search for the song and lock in a guess, or skip to unlock more time. Seven tries. The sooner you get it, the better. Win or lose, the full song plays at the end.