Whole Cake Island is finally here, and it is easily one of the most unique islands GPO has added in a long time. It is not just another grind zone — it introduces puzzle dungeons, mirror raids, and two major bosses that completely change late–game farming routes.
If you’re logging in after the update and wondering where to go first, this guide walks you through everything step-by-step.
Where Whole Cake Island Is Located in Grand Piece Online
Whole Cake Island is accessed from Dressrosa.
From Dressrosa:
- Go to the back side of the island
- Face directly west
- Start sailing or flying straight west
It takes a bit of travel time, but if you keep heading west you will eventually reach Whole Cake Island. If you use any flying fruit (like Goro), you’ll get there much faster.
Once you see candy-colored terrain and strange musical NPCs, you’ve arrived.
What Makes Whole Cake Special
This island isn’t just about quests. It introduces three major systems:
- A puzzle-based Big Mom dungeon
- A mirror raid for Katakuri
- A public coliseum area
It also features new quest lines, unique NPC enemies, and completely different scenery from any other island in the game.
Big Mom Dungeon (How It Works)
In the center of the island, you’ll find the entrance to Big Mom’s dungeon.
This dungeon works differently from Impel Down:
- It does NOT teleport you into a private server
- It happens inside the public world
- You move through rooms by solving puzzles
- Some rooms require choosing correct doors
- Others force you to fight special NPCs
At the end of the dungeon, you fight Big Mom herself.
This is where you can obtain:
- Big Mom’s weapon
- Big Mom’s outfit
- Other rare boss drops
The dungeon is faster and more puzzle-oriented than Impel Down, making it easier to farm repeatedly.
Katakuri Mirror Raid Location
Katakuri is fought through a special Mirror World portal.
Where it spawns:
- Go to the far end of Whole Cake Island
- Look for the area labeled Mirror World
- A mirror portal spawns in the corner of this area periodically
When the mirror appears:
- Enter it
- You will be taken into the Mirror World
- Fight Katakuri inside
Katakuri drops:
- His weapon
- Possible clothing items
- High-value gear
This becomes one of the most important late-game farm spots in the update.
Quests & First Things To Do
When you first arrive, take the forest quest near the entrance:
- You’ll fight Big Mom’s homie NPCs
- These NPCs are aggressive and unique to the island
- They’re great for early Whole Cake grinding
After that, your progression naturally pushes you toward the dungeon and mirror raids.
Coliseum
Whole Cake Island also has a public coliseum:
- Great for hosting player tournaments
- PvP battles
- Community events
- Looks amazing and adds social depth to the island
Whole Cake Island is not just another grind map — it’s a full content hub.
You get:
- Puzzle dungeons
- Two major endgame bosses
- Public PvP space
- New farming routes
- Completely fresh scenery
If you’re a late-game GPO player, Whole Cake is now one of the most important islands in the game. It will absolutely be a core part of endgame farming moving forward.
Once you run it a few times, you’ll realize this update quietly added some of the best repeatable content GPO has ever had.