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1. Home Sweet Home
Description: Visit every area in and around the tree house.
Gamerscore Worth: 20G
How to Earn: You will be required to visit every area in the Treehouse as you progress through the game. However you can knock this out before you start your first investigation as you will have full access to the Treehouse from the start of the game. The rooms to visit are:

Bedroom
Observatory
Main Room (Upper)
Secondary Room (Upper, need to cross the rope bridge)
Main Room (Lower)
Bathroom
Secondary Room (Lower, the armory)
Loot Room
Outside (Go out the door in the Loot Room)

2. I See You
Description: Use the telescope in the boat to look at three different kingdoms.
Gamerscore Worth: 30G
How to Earn: Missable!

The telescope is found on the upper balcony of the Treehouse. Walk up to the telescope and press B to look through it. Look at each of the kingdoms, which are, Fire Kingdom, Candy Kingdom, and the Ice Kingdom, by pressing Right Bumper to cycle through each of them.

3. Snail's Pace
Description: Locate and interact with 15 snails.
Gamerscore Worth: 60G
How to Earn: Missable!

There are 3 snails for each investigation. This will have to be done in one complete playthrough, as there is no chapter select or back tracking to previously
visited areas. The locations for all the snails can be found below:

First investigation:

Snail 1: The first snail is in the Candy Kingdom. After you sneak into the Kingdom through the sewers, a fight will occur. Soon thereafter there is a cutscene with Princess Bubblegum. After the cutscene it will be immediately to your right.
Snail 2: When you first gain entry to Ron James' Shop, it will be to your right near the fireplace.
Snail 3: When you get to the lowest level of Ron James' basement (when you go through the manhole), it will be sitting on a pipe near the far right of the area.
Second investigation:

Snail 4: When you get to Lumpy Space Princess's camp in the forest it will be sitting on a broken washer sticking out of the ground.
Snail 5: When you exit the Candy Palace the snail will be sitting on the table closest to the palace stairs near the bottom of the screen.
Snail 6: Near the very end of this investigation the Snail will be sitting at the bottom of the stairs in the Fiona and Cake archives. DO NOT click on the Lumpy Space Princess before you try and click the snail as this will end the investigation.

Third investigation:

Snail 7: When you reach Magic Mans house derelict house, this snail is by the front tire of the green car.
Snail 8: Before you fight the third boss you will be helping the Lumpy Space Princess by turning a giant speaker. The snail will be sitting in plain sight near the bottom of the screen.
Snail 9: As soon as you break out of Lemongrabs Cell, he will be sitting on the top of a barrel nearby at the northern end of the room.

Fourth investigation:

Snail 10: This snail is in the Fire Kingdom core. After you raise the second bridge you will see him sitting on the wall below the scaffolding. When you approach it, you'll trigger a combat sequence. After you complete the combat you can interact with it.
Snail 11: This one is a bit harder to find. When you are in the cave, to get a quest item, you will have to use Jake to be lifted up to two platforms in one section. On the top section you will interact with a blue crystal to get a quest item. The snail is next to this blue crystal. It is in the section where you have to get a wand from a golden dragon's mouth.
Snail 12: At the very end of this investigation you will burn a bill of sale. BEFORE YOU DO THIS, go to the yard sale table farthest from Marceline. The snail will be sitting on top of the table.

Fifth investigation:

Snail 13: When you go back to the Wizard City, the Snail will be sitting on the stairs of the shop between Ron James' shop and the vending machine.
Snail 14: This snail is in the Palace of the Ice King. The snail is located in the bottom of the Ninja Armory Room, the same location where you used underwear to fire old pizza at the rebelling penguin.
Snail 15: This snail is sitting in plain sight immediately to the left of the Flame Princess when you first go to recruit her into your band.

4. Wrong Number
Description: Dial 10 wrong numbers on the pay phone.
Gamerscore Worth: 20G
How to Earn: Missable!

During the first investigation In the Wizard City. There will be a red phone booth outside of Ron James store. When you first arrive at Wizard City the phone booth will be out of order. After gaining access to Ron James store for the first time the phone booth will be operational.

Now walk into the phone booth and use B to interact with it. You will randomly call someone in the Land of Ooo. After every call you make the phone booth will give back your money, repeat this process 10 times. This will be the only time you'll be able to do this.

There will be another point in another investigation where you will return to the phone booth and order a pizza. The option to call random numbers will not be available. So make sure to do this during the very first investigation.

5. Radio Starchie
Description: Listen to all of the radio broadcasts in the Tree House bedroom.
Gamerscore Worth: 60G
How to Earn: Missable!

The radio is located on a table in Finn and Jack's bedroom. You will need to listen to the radio before starting a new investigation. Each broadcast consist of 3 parts. And has Starchie giving you a brief idea of what the next investigation will be about. If you do not listen to the broadcast before starting a new investigation, you will have to play through the entire game again.

6. Stretch Goals
Description: Use all four Jake combat forms at least once in the game.
Gamerscore Worth: 30G
How to Earn: Missable!

Jack has 4 different combat forms that can be used during different combat sections of the game. Once the combat meter at the bottom of the screen is full, you can activate a combat form by using D-Pad Up, D-Pad Left, D-Pad Down, D-Pad Right. You do not have to use all 4 combat forms in one combat section. Combat sections can be replayed after completing them to earn additional loot and giving you the option to use Jake's other combat forms.

7. Combo Time
Description: Perform a 15-hit combo in combat without being hit.
Gamerscore Worth: 60G
How to Earn: Missable!

It can be highly unlikely that you will complete the game without performing a 15-hit combo, but can happen. There will be plenty of combat sections through the game, although the very first combat section would be the easiest. Just take your time and avoid being hit by an enemy as this will cause your combo to drop. Also activating a special ability will reset your combo meter.

8. New to Ooo
Description: Say hello to the new character in Ooo.
Gamerscore Worth: 60G
How to Earn: Missable!

The new character of Ooo can be found during the second investigation. You will be going around the Candy Kingdom fixing the mess LSP caused. Eventually you will enter a bad part of town that has boarded up candy houses and also see the Angry Cookie character. As soon as you enter there will be a blue character with blond hair and a backpack. Simply go up to him and talk with him using B, go through all the dialogue tree until all dialogue has been exhausted.

1. Cake Plate Quest
Description: Free Abracadaniel from jail.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after freeing Abracadaniel from the dungeon and escaping from the Candy Kingdom through the Wizard Portal to the Wizard City.

2. Wizards Only, Fools
Description: Find a way to get into the wizard "party."
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after going to getting all the snacks for the Ice King to being to the Wizard Party.

3. Sweet, Sweet Magic
Description: Defeat the wizards and free the kidnapped Candy People.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after defeating the Wizards and returning back to the Treehouse after completing the investigation.

4. Hairy Beast
Description: Find the hairy beast that has been wreaking havoc.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after rescuing the Ice King from the forest and learning why he has been living in the forest.

5. Lump Support
Description: Fix all of the noble deeds that were done incorrectly.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after Finn and Jake go around the Candy Kingdom fixing all the "good" deeds that LSP claims to have done and return to the coronation room.

6. Long Live The (Ice) King
Description: Put the king back in charge of his kingdom.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after you have dethroned LSP as the ruler of the Ice Kingdom and returning to the Treehouse.

7. Dance OFF
Description: Find a cure for the dancing epidemic.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks confronting Magic Man at his house and break the dancing spell he placed to all the people in the Land of Ooo.

8. Sound Sword Quest
Description: Find the missing Sound Sword.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after successfully protecting the Fire Princess from 3 groups of guards from capturing her.

9. Acceptable Ending
Description: Defeat Magic Man's latest jerky plan.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after escaping and defeating Magic Man and Lemongrab and returning to the Treehouse.

10. Wet Willie
Description: Find out why the Fire Kingdom's flames are going out.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after reaching the core in the Fire Kingdom and taking the magic device from Starchie.

11. Cracked
Description: Escape from the dungeon below Billy's Cave.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after collecting all of the artifacts around Billy's Cave and placing them back on his throne.

12. Nothung To Lose
Description: Find the last of the artifacts and seal Billy's Cave.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after retrieving Billy's sword Nothung and bringing it back to Billy's Cave.

13. Record Loss
Description: Gather the equipment needed to re-record Finn's record.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after returning from the Wizard City with all the magical music equipment and taken it back to Marceline's house.

14. Band Together
Description: Convince Finn's friends to join the band.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks after recruiting the Ice King and Lemongrab to join the band and returning to Marceline's house.

15. Real To Reel
Description: Put Finn's favorite song back onto the record album.
Gamerscore Worth: 40G
How to Earn: Story related and cannot be missed!

Unlocks once returning to Marceline's house after recruiting Fire Princess and LSP for the band. Also you will need to collect all of Princess Bubblegum's missing outfits.

16. Flimpin' The Diode
Description: Correctly guess the Grayble theme.
Gamerscore Worth: 60G
How to Earn: Missable!

At the very end of the game, The Grayble will ask you a question that will need to be answered correctly. The answer to the questions is Emotion. The Grayble will then explain why Emotions is the right answer. Make sure you answer correctly because you answer wrong you will have to play through the entire game again.