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Make your way up the floating blocks of ice using your High Jump and newly acquired glide ability. After reaching the halfway point, Donald & Goofy will leave the party, and the injured Beast will join your party.
Descend the Castle to the Waterway
NEW HEARTLESS: Darkball, Defender, Wizard, Wyvern
Allow Beast to defeat the Heartless during this time, as the Wooden Sword has virtually no power against them. Continue to ascend the floating platforms and examine the pedestal at the top in order to reach the castle. When you arrive, turn right and examine the node at the edge of the area to descend; jump into the bubble in the northeast corner to enter the waterway.
Unlock the Castle Doors
Once you are in the waterway, save your progress at the nearby save station. Use the Call command on breakable walls. Jump into the higher bubble, then use the switches on the walls to reach the next bubble.
In the next room, examine the switch to raise the platform, then examine the large mechanism that opens the castle door. Once you activate it, return to the castle by the way you came and continue into the entrance hall.
Riku
Return the Library Books
Enter through the doors on the left above the left staircase to reach the library. Books are scattered all around the library; you will find some on the floor and others on the wrong shelf. Return the books to their corresponding collections to reach the upper balcony of the entrance hall.
Instructions Screenshot Pick up Khama Vol. 8 on the ground in the corner. 
Place Khama Vol. 8 in the bookcase opposite where the book was. 
Pick up Mava Vol. 6 from the last shelf on the second floor. 
Activate the Green Trinity on the second floor to pick up Azal Vol. 3. 
Pick up Theon Vol. 6 from the table on the second floor. 
Place Azal Vol. 3 on the shelf in the middle of the first floor. 
Take Salegg Vol. 6 from the shelf of green volumes on the first floor. 
Examine the empty space on the right side of the same shelf to place Mava Vol. 6. 
Place Salegg Vol. 6 in the shelf directly opposite from the previous shelf. 
Pick up Nahara Vol. 5 from the shelf in the middle of the first floor. 
Place Nahara Vol. 5 on the third shelf along the wall of the second floor. 
Pick up Mava Vol. 3 from newly accessible shelf in front of you. Place Mava Vol. 3 in the remaining empty space on the shelf in the corner of the first floor. 
Pick up Hafet Vol. 4 from the small desk in front of you. 
Place Hafet Vol. 4 on the receded shelf along the wall of the second floor. 
Place Theon Vol. 6 on the last shelf along the wall of the second floor. 
Push the exposed button on the wall to unlock the door leading to the entrance hall balcony. 
Gather the Emblem Pieces
Now you must find the four Emblem Pieces hidden behind puzzles scattered around the second floor of the entrance hall:
Instructions Screenshot Break the pots next to the statue near the doors to the library. The emblem piece will drop from the fountain below. 
Light the candles along the walls using fire magic. The flame in the center of the area will go out, revealing an emblem piece. 
Perform the Red Trinity on the statue on the sound end of the hall. The statue will fall and shatter, revealing an emblem piece. 
Push the statue on the wall opposite from library doors. A chest will appear on a platform below, containing the last piece. 
Cast Thunder magic on the obelisk marked with a lightning symbol to allow the platforms to move. 
Ascend to the Castle Chapel
Save your progress in the library and examine the door at the back of the entrance hall to insert the four emblem pieces and unseal the way. Make your way through the upper levels of the castle until you reach the Castle Chapel. When you reach the Castle Chapel, equip curative items and set Gravity magic to your shortcut menu, then walk to the back of the area.
Maleficent
When you are ready to proceed, equip curative items as needed, save your progress at the nearby save station, and enter through the dark portal.
Maleficent Dragon
Proceed to the Grand Hall
After defeating Maleficent, a new passage will appear in the chapel; save your progress and travel through this new passage and into the grand hall. Equip curative items as needed and proceed up the stairs.
Ansem Riku
Descend to the Entrance Hall
When you regain control as a Heartless, travel through the castle and return to entrance hall where you first fought Riku. You can jump off the side of the castle to reach the first levels of the castle more quickly.
When you reach the entrance hall, approach Kairi to progress the story. You will automatically be transported to Traverse Town.
