Costumes are alternative cosmetic appearances for Cookies, introduced in the Halloween Masquerade update (version 2.3.001) on October 28, 2021. They are acquired by drawing from the Costume Gacha with Rainbow Cubes, and can be used to change their Cookie's appearance. Collecting Costumes belonging to a Costume Set grants stat buffs based on the number of Costumes owned from that set.
Costumes have rarities separate from their Cookies' rarities, determining both the likelihood at which they might be drawn from the Costume Gacha and the amount of Rainbow Crystals given if a duplicate is drawn. Some Costumes, typically Epic ones, may even change the visual effects of their Cookies' attacks, Skills, or summoned units.
Costumes and the Costume Gacha are unlocked by completing a quest accessed after clearing World Exploration Stage 2-13.
Quest
| Quest Label | Description | Reward | |||
|---|---|---|---|---|---|
| Final Preparations | Deliver Sweet Jelly Jam x5 |  800 |
 800 |
 300 | |
| Note: These Rainbow Cubes are used up in the tutorial costume pull that follows the quest. | |||||
