Blackberries are a standard mixable available in Papa's Freezeria DELUXE. The mixable is unlocked on Rank 18 with Tess.
Blackberries are a holiday exclusive topper available in Papa's Waffle Mia! during Halloween. The topper is unlocked on Day 2 of Halloween.
Blackberries is a standard mixable available in Papa's Freezeria Deluxe Refined. The mixable is unlocked on Day 155 with John (Matty0502).
Blackberries are a holiday-exclusive fruit available during Comet Con in Papa's Squeezeria. The fruit is unlocked at Day 2 of the holiday.
Blackberries is a standard shaker available to customers in the sweet version of Papa's Crêperia. The shaker is unlocked with Otoko when the player reaches Rank 46.
Blackberries is a standard mixable available in Mama's Frogurteria. It is unlocked on Rank 120.
Blackberries are a standard fruit available in Papa's Cobbleria ReSeasoned. The fruit is available at the start of the game.
Blackberries are a standard mixable available in Papa's Freezeria All In!!. It is unlocked with Kenneth when the player reaches at Rank 24.