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Brain Gum is an A-grade pet. It accompanies Zombie Cookie as their combo Pet.


Slows down Energy drain.


Blows fantastic bubbles and improves Cookie's IQ to enable them to use up Energy slower.

Strategy Edit

Brain Gum is widely considered the best A-grade Pet. It is an ideal pet for players who want to run for a long time (such as when farming for Mystery Boxes, but lack certain Potion-producing S-grade pets. It is currently one of three Pets that slow down Energy drain, the others being Green Apple Rabbit, and Uncooling Teacup.


Level Skill Effect Upgrade Cost
1 8% slower N/A
2 9% slower 17,000
3 10% slower 20,000
4 11% slower 23,000
5 12% slower 26,000
6 13% slower 29,000
7 14% slower 35,000
8 15% slower 42,000

Updates Edit


  • Brain Gum used to help drain energy 10-32% slower, but this was modified December 18, 2014 with the New World update, making the pet inferior to Green Apple Rabbit.
  • Brain Gum can be spotted in-game in Stage 2, encased in a glass jar.
  • Its combo with Zombie Cookie likely alludes to zombies' affinity for eating brains in popular culture.
  • It used to be a combi for Cream Cookie.
  • Maxing out the pet will give you A Piece of Brain Gum as a reward.