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.


Slows down Energy drain.


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


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

Possible Combination Bonus Edit

Cookie Combi Bonus
Zombie Cookie
Zombie Cookie (A) 10 extra Energy when reviving as a Zombie

Updates Edit


  • Brain Gum used to have helped drain energy 10-32% slower, but it was modified in December 18, 2014 with the New World update, making the pet more inferior to Green Apple Rabbit.
  • Brain Gum is one of the pets which can be spotted in-game. It appears in stage 2 encased in a glass jar.
  • Its best combo for Zombie Cookie was believed mainly because from popular culture, zombies love eating brains.
  • It used to be a combi bonus with Cream Cookie.


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