Treyarch, AvengedSevenfold, NMEMagazine, and more have released a series of images of puzzle pieces on Instagram. The puzzle appears to be teasing a new song that is likely to be featured in Black Ops 4 Zombies.

Redditors quickly picked up on this and began to put the pieces together. The completed puzzle forms an image of Black Ops 4’s ‘IX’ Zombies map with the text at the bottom reading Avenged Sevenfold ‘Mad Hatter’.

via /r/AvengedSevenfold

Avenged Sevenfold described the song in an interview with Kerrang!

The song is dark and brooding. We wanted to capture a difference feeling than a straight-ahead ‘zombie killer’ track. These songs are good places for us to experiment with our sound. I would put this in the category of ‘dark alternative.

It’s confirmed that the song will be revealed alongside a gameplay trailer for Black Ops 4. A7X also says that they have more projects with Treyarch in the works for later down the line, perhaps songs for the DLC Zombies maps.

We will be using game footage to present the song. Further down the line we are working on some cool things with Treyarch to enhance the Black Ops 4 experience.