This one is very different: I have a puzzle which will have your players collecting four pieces of music, which they have to combine by playing them simultaneously.

Here’s how to deploy this puzzle:

• The players discover a scrap of music, but it sounds disjointed and awful. Send one of your players one of the four audio files attached to this post. Instruct the player to keep the audio file on their phone.
• Later, the players discover more music two more times, and you send different players one of the four audio files. (No single player should have multiple files — we want them to collaborate to complete the puzzle.)
• Finally, the players encounter a room in a dungeon which is playing the last remaining audio file on a loop. The solution is for the players to simultaneously press ‘play’ on audio files they each have saved on their phone.

This was inspired by an encounter with Shalfi the Bard in Phandelver & Below: The Shattered Obelisk. He’s a madman the players meet in Chapter 8, a horrific dungeon shaped like a brain.