Popular musicians  have created a one of a kind music video experience after teaming up with Sleep Better. Their original song is obviously about sleep, and the music video tells the tale of a family after dark who have unwanted visitors.

But what makes this video so special, and therefore viral, is the interactive game involved. Two nearly identical music videos of the same song play side by side with only minute differences.

The game is for the viewers to catch and count as many differences, and submit them to Sleep Better’s Facebook application.

And no, slightly different choreography and location positioning does not count. So, how many differences can you spot?