Because you have to have all the worlds to 100%, all Keyblades, all special attacks and all prizes hidden or secret.
When you have them you can go in there and you can see the big secret behind the x-blade, and also why it is that the Ventus has! It is highly and still earn a exclusive keyblade!
I think the reason why is because Xehanort was the first one to leave Destiny Islands, and Riku was going to be like him and leave as well...?
-Slight Spoiler-Yes. Terra meets Sora and Riku at Destiny Islands in Kingdom Hearts Birth by Sleep.
Maybe, but it depends on which game your talking about. Kingdom Hearts Birth by sleep Sora is just a little kid that you meet at Destiny Islands for like 5 mins and for Kingdom Hearts 3, He should be the main character in it. I don't see why he wouldn't be.
Kingdom Hearts Birth by Sleep is for the PSP.
Kingdom Hearts Birth by Sleep happened in 2010.
Riku is in Kingdom Hearts because he is one of Sora's friends on Destiny Island, and an important character in the series.*Slight Spoiler*As we later find out, Riku's destiny was written when he was chosen as a Keyblade-wielder, during the events of Kingdom Hearts Birth by Sleep.
kingdom hearts birth by sleep is for psp
Terra is one of the main protagonists in Kingdom Hearts Birth by Sleep.
No, Kingdom Hearts Birth By Sleep is special to the PSP
Kingdom Hearts Birth by Sleep was created on 2010-01-09.
Birth by Sleep is for the PSP
Yes, Kingdom Hearts Birth by Sleep was released on September 9th, 2010 in the UK.