Note by ShadoFang13: Not finished with all of the details for this yet, going to add general information first and refine whenever I have time later on.

The Medusa's Head Labyrinth is unlocked upon reaching lvl 23

Perfect Clear requirement: like other Labyrinths, remain alive for entire duration.

First map enemies are Fast Tang, Bloody Tang, and Oldest Hijack Bro (miniboss)

Second map (boss room) is Fast Tangs, Bloosy Tangs, Spoker (M5 miniboss) and Fenly (M9 Boss)

Objective for this part of the Labyrinth: Defeat Fenly