If you’re trying to unlock the Slime Key in Sailor Piece, the game doesn’t exactly make it obvious how the system works. A lot of players end up collecting slime fragments randomly, only to realize later that none of them counted because there’s one strict rule: you must collect all seven slime pieces in the exact order the quest requires.
This isn’t just a simple scavenger hunt. It’s an order-based progression puzzle, and missing even one step forces you to start over. That’s why understanding how the quest works before you begin will save you a huge amount of time.
Where to Start the Slime Piece Quest
Your first step is traveling to Slime Island. Once you arrive, look for the Slime Key Crafter NPC. He’s the only NPC involved in this questline, and speaking to him activates the slime collection objective.
When you talk to him for the first time, he’ll tell you to gather seven slime pieces in a specific sequence. The game does not show the order on your screen, so you have to follow the intended route carefully.
This is the most important part of the entire quest — collecting them out of order will not count toward progression.
Why the Order Matters
Unlike most collection quests in Sailor Piece, slime fragments aren’t independent items. The system works like a chain trigger, meaning each piece only becomes valid after you’ve picked up the previous one.
If you grab the wrong piece early, the game simply ignores it, and you’ll have to go back later once you reach the correct step.
Because of this mechanic, the best approach is to follow a continuous path around the island instead of jumping between locations.
Slime Piece Locations in the Correct Order
The slime pieces are scattered across Slime Island, usually placed near terrain edges, structures, or slightly hidden corners. They’re not extremely hard to see, but they’re positioned in a way that encourages exploration rather than direct visibility.
The first piece is located near the starting side of the island, relatively close to where players usually land. It acts as the entry point to the sequence.
The second and third pieces are positioned further inland, requiring you to move deeper into the island’s terrain. These are often found near environmental landmarks rather than open ground.
The fourth and fifth pieces tend to push players toward the outer sections of the island, encouraging a circular route around the map.
The sixth piece is usually located in a slightly more hidden area compared to earlier ones, making it the first location where players commonly get stuck.
The seventh and final slime piece sits near the far side of the island, completing the full loop and signaling the end of the collection chain.
Crafting the Slime Key
Once all seven pieces have been collected in the correct order, return to the Slime Key Crafter NPC and speak with him again. He will automatically combine the fragments and craft the Slime Key for you.
There are no additional requirements after collecting the pieces, so this step is immediate.
What the Slime Key Is Used For
The Slime Key typically unlocks special slime-related content, which may include hidden areas, boss encounters, or exclusive loot zones depending on your current game progression.
Because of this, obtaining the key is often a necessary step for players who want to access certain mid-game or event content.
Tips to Complete the Quest Faster
The biggest mistake players make is trying to explore randomly instead of following a clear route. Since order is everything in this quest, staying on a continuous path across the island prevents backtracking and confusion.
Another useful tip is to focus only on slime pieces while doing this quest. Trying to multitask with other activities often leads to accidentally picking pieces out of sequence.
The Slime Piece quest in Sailor Piece isn’t difficult in terms of combat or mechanics, but its strict order requirement makes it one of the more frustrating collection tasks for unprepared players.
Once you understand that it’s essentially a guided path around Slime Island rather than a random hunt, the process becomes much simpler. Follow the correct sequence, collect all seven pieces without skipping steps, and you’ll have the Slime Key ready with minimal effort.