Portal

Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
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Portal is a gameplay element introduced in Kingdom Hearts 3D: Dream Drop Distance. They are a special type of communication system that allow characters from various Dream Worlds communicate, sometimes, even transport from one version of that world to another. These Portals usually manifest fisically as orbs with various spikes around them, with the image of that world inside the orb.

Story

When Riku arrives atTraverse Town, he meets Joshua, who asks Riku where is his Portal. Riku asks him what is a Portal. Joshua explains that world is split in half and that he arrived there through a Portal, which he can also use to pass between the different versions of Traverse Town, and asks Riku to find Rhyme, who is the key to the Portal.

Before battling Hockomonckey, Sora encounters Neku above in the Fifth District and asks him if Rhyme is his game partner. Neku says that he is teamed up with somebody else, just before Rhyme suddenly disapearing and a guy in a Black Coat summoning Hockomonckey. After defeating him, Sora and his friends are temporarilly able to see what's happening on the other version of Traverse Town. After trying to go after Riku, a voice calls Sora and a Portal appear behind him. Then, Joshua and Rhyme appears. Joshua explains that traverse Town is split in two, and that Rhyme's dream are his Portal, which allow him to go to both Traverse Town.

After defeating Xehanort's Heartless in The World That Never Was, Riku enters Sora's side through a portal. This portal can also be used to return to the World Map of Riku's side.

After defeating Young Xehanort, on The Mysterious Tower, Riku opens a Portal to enter Sora's heart and wake it from his sleep.

Link Portals

A Link Portal in Kingdom Hearts 3D: Dream Drop Distance. It's possible to see the pink dot and the sign in the lower Touch Screen. Shown is a Friendship Portal.

Link Portals are a type of portal that can be found in all Sleeping Worlds. They give special challenges for the protagonists, Rare Nightmares to battle, other Spirit's party or even allow them to battle stronger versions of the bosses, rewarding the player with Droplets, Dream Pieces, and other prizes if they are completed. Each portal belongs to a "player", usually named from a Final Fantasy character, like Auron, for example.

Mechanics

After the first few drops, Link Portals begin appearing troughout the worlds. They are displayed as pink dots in the lower Touch Screen, but they can't be seen in the top screen. When the player moves near the point where the portal is located, a small sign with the name of the owner, the difficulty rank, represented by five stars, and a symbol of the type of challenge or the Spirit Party of the portal will appear in the Touch Screen. If the player touches that sign, more details about the Link Portal will appear in the top screen. After reading the details, the player can decide to open or not the Link Portal.

There are four different types of Link Portals:

• Battle Portals: These portals give the player a series of Nightmares to battle, according to another "player" Spirits. It also gives a "Bonus Objective" to be accomplished during the battle like deefeating all Nightmares in a set time limit or doing a number of Flowmotion attacks. After opening the battle Portal, the word "start" will appear. After cleraing the portal, either accomplishing the bonus objective or not, the word "finish" will appear, followed by the results of the portal, telling the player what was obtained. The player receive extra Drop Points and one of several prizes, like a Dream Piece. If the Bonus Objective was achieved, one of various possible bonus prizes will also be received.

• Friendship Portals: These portals allow the player to temporarily borrow another player's Spirits. If this portal is activated, the player Spirits will be temporarily exchanged for the Friendship Portal Spirits, which come with the Link Gauge full and the HP gauge replaced by a time gauge divided in four segments that deplet over time. When that gauge runs out, the Spirits are exchange with the player Spirits again.

• Special Portals: These portals pits the player against Rare Nightmares and give even better prizes, like Dream Eater recipes. There are six Special Portals for each character in each world, with the exception of The World That Never Was, that has only three. Only one will be open in any given world per drop. After beaten, they can not be entered again unless the player completes all of them. After all are beaten with one character, that character will receive the End of Pain Keychain.

• Secret Portals: These portals are unlocked after beating the game. In them, the player can battle stronger versions of the bosses of the world they are in. After all are beaten with one character, that character will receive the Unbound Keychain.