Successfully complete Chapter 10. Then, complete the indicated task to unlock the corresponding dungeon. After clearing an extra dungeon, you can find a treasure chest on the last floor. NoteThe Spinda's Juice Bar Cafe events are random.

Dungeon	Task to complete
Bottomless Sea	Get the "Secret" rank and receive the job from Spinda's Cafe.
Destiny Tower	Complete the game and make drinks at Spinda's Juice Bar.
Giant Volcano	Get the "Secret" rank and receive the job from Spinda's Cafe.
Happy Outlook	Complete the game and make drinks at Spinda's Juice Bar.
Inferno Cave	Get "Guildmaster" rank.
Labyrinth Cave	Complete the game and find a job with unknown for the Place.
Lake Afar	Make 100 Recycles.
Landslide Cave	Make 3 Recycles.
Lost Wilderness	Complete the game and make drinks at Spinda's Juice Bar.
Lush Prairie	Make drinks at Spinda's Juice Bar.
Midnight Forest	Complete the game and find a job with unknown for the Place.
Mt. Avalanche	Get the "Secret" rank and receive the job from Spinda's Cafe.
Mt. Mistral	Complete the game and make drinks at Spinda's Juice Bar.
Mystery Jungle	Get the "Secret" rank and receive the job from Spinda's Cafe.
Oblivion Forest	Get Master 1 Star Rank.
Oran Forest	Make 60 Recycles.
Serenity River	Make drinks at Spinda's Juice Bar.
Shimmer Desert	Get the "Secret" rank and receive the job from Spinda's Cafe.
Shimmer Hill	Complete the game and find a job with unknown for the Place.
Sky Stairway	Get the "Secret" rank and receive the job from Spinda's Cafe.
Southern Islands	Get "Master 3 Star" rank.
Star Cave	Clear Special Episode 1 and get the "Secret" rank, then get Jirachi's Challenge Letter from Spinda's Cafe.
Tiny Meadow	Make 25 Recycles.
Treacherous Waters	Get "Master 2 Star" rank.
World Abyss	Get the "Secret" rank and receive the job from Spinda's Cafe.
Zero Island Center	Graduate from the Guild and do 150 Recycles.