Mama Gurdy resides inside of the wall at the top of the room. She has three attacks:
- She can create temporary spikes in the boss room that act as normal spikes, dealing damage unless Isaac has flight.
- The Callus trinket does NOT protect Isaac from these spikes.
- She can spew a volley of orange shots toward the bottom of the room, leaving creep that slows Isaac, and doing 1 heart of damage.
- She can shoot 3, 4, or 7 waves of 5 spread blood shots at Isaac's location.
- She can shoot a volley of blood shots at Isaac.
Sometimes, Mama Gurdy will "hide" by going behind the wall before executing her spike attack, making her unable to take hits until she emerges.
- Mama Gurdy appears to be a mature version of the Gurdy boss series, with the pupae version being Gurdy and the egg and larva stages being Gurglings and Gurdy Jr. respectively (and possibly the B Lickers).
- Unlike most other bosses, Mama Gurdy's health bar is shown at the bottom of the screen instead of the top. This also applies for the The Haunt.
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