Baspinar's Castle:

Own any Oglue pet

Biala Mountain:

Complete Level 4 or higher Blitzen's Grotto mission

Candyland:

Complete 225 or more Candy Tree quests

City Sewers:

Complete 25 or more Sewer Monster quests

City of Marada:

Use the Hospital to cure a pet with Common Cold

Dukka Caves:

You need to use any Rarity 15 or higher Potions item

Eleka's Castle:

You need to use a Book of Fate item

Enpiah:

Create any Minipet at the Laboratory

Foxfire Forest:

Start a School lesson that Wise Walee pays for

Gigantic Paradise:

Complete 125 or more Farming quests

Jenoa:

Complete Level 15 or higher Clam mission

Kamilah Desert:

Complete 25 or more Hump Racing quests

Lowlyhood:

Enter the Beauty Contest

Lush Lake:

Enter the Olympics at Ultimate Level or higher

Minipet Island:

Own any pet wearing a Baby Costume

Nimbus:

Own any pet wearing a Fairy Costume

Puchalla Village:

Own any pet wearing a Cheese Costume

Simeria:

Complete Level 5 or higher Hector the Collector mission

Slater Park:

Complete the Enchanted Plushie Instructions at Enchanted Plushie Machine

Undying Woods:

Own any pet wearing a Ghost Costume

Vortex Park:

Complete 25 or more Shusan quests

Ziranek:

Own any pet wearing a Digital Costume