Walkthrough
Quick Walkthrough Checklist available.
Prologue
You start your adventure inside Twinsen and Luna's house on Citadel Island. Go meet Luna that is waiting for you in front of the entrance of the house. After a short dialog, you will meet Zoé. Move on the top right of your screen to find the Boingball court. After a short dialog, you will learn how to throw a ball. Here, you will learn how to throw and how to change the curve of your throw.
Pro tip: if you want to get a high score, go get some balls in the basket before starting the sequence.
After the intervention of Snavus, you will have to look for Luna. She's close to your house next to the sea.
Chapter 1

How to escape the asylum
In your cell, jump or attack to trigger the platform with the nurse in it. Attack him and move on the platform. Destroy the nurse and the doctor to retrieve a key. After the first door, run to destroy the nurse. Go into the room on the right to find your holomap, your ID card and a disguise of nurse. You are now considered as a nurse to nurses only. Go on the top and destroy the first nurse close to the alarm. After that, you can get the last key by destroying the doctor in front of the door. You have now escaped the asylum.
Achievement tip: To get the achievement My Little Big Adventure, you need to get caught at least once in the asylum.
Go back home
Go and talk with P.U, he will give you a tip on how to pass the closed gate. Go into the first house to meet Alfred. You will get 25 kashes in his chest. Then, go inside the sewers to retrieve a clover box. You will also meet Bunny and learn about the Rebels. Go back outside and go directly to your house. Don't try to fight. In front of your house, you will meet Luna. After a short cutscene, Luna asks you to hide in the bathroom. After the arrest of Luna, you will start to hear some strange voices. Go into your dad's room and retrieve your Magicball and your tunic. Get out of the house by the chimney.
Leave the island
Go to the tavern Chez Luc. Go upstairs and talk with Jojo. Find Tim the waiter to pay him a drink. Go back to Jojo, he will tell you to go the harbor. Destroy the clone and get the key. Talk with Paul and enter the warehouse. Solve the puzzle and go back to Paul. With the ferry ticket, you can now go to Principal Island.
Pro tip: Before going to the harbor, go to the pharmacy to retrieve the syrup. You will have to fight a Groboclone.
Achievement tip: To get the achievement My Little Big Adventure, you need to talk to Rita, who works at the ticket office.
Chapter 2

Earn the trust of the inhabitants
After arriving on Principal Island, go north/west to arrive in the Old-Burg. People will avoid you as they don't trust you. You need to destroy the yellow rabbiclone. After that, Camélia will get you to her cousin Cy. She will get you to her house. Go "wash your hands" and enter the secret passage. You will now be at the locksmith. Pénélope will give you a key once you are outside.
Free Bob Vortix
Avoid the Supergro and talk with Iza. She will ask for a rebel costume. Enter the costume shop and buy the rebel costume. Go back to Iza. You can now go on the upper levels and enter Bob Vortix's house. Inside the house, talk with Bob. Go through the cellar and destroy the Groboclone.
Pro tip: next to the tavern, move the small crate towards the lower level. It will help you come back faster.
The library
Bob Vortix tells you to go to the library. Go there and meet Pages. She will tell you about the strange taste of the water. You now need to go to Peg Leg Street and take the motocycle. Be careful, you need to buy gas first in the shop next to Iza was standing. Take the motocycle and go inside the water tower. There, use the syrup. Go back to the library and talk with Pages. She will grant you access to a special room where you will learn about the Sendells and the Temple of Bù.
Chapter 3

Reach the Temple of Bù
Go north and find the buggy. You will reach Port-Belooga. There, talk with the fisherman to reach the White Leaf Desert. Go thought the platforming phase and destroy the soldier in front of the gate to get a key. Continue and talk with the Old Sage. Jump inside the well.
Inside the Temple of Bù
In the first part, you need to retrieve a statue to activate the door to the second part of the temple. In the second part, keep moving forward and retrieve the Book of Bù.
Chapter 4
Buy the catamaran
After retrieving the Book of Bù, go back to your house. You are now able to read the plate inside your secret cave. You now need to go to reach Proxima Island and find the treasure of Pirate LeBorgne. To do so, you first need to collect 200 Kashes. Then, go to Port-Belooga and buy the catamaran from Tomas. You can now go to Proxima Island.