V - There is still a lot of mystery about the Keyblades I think. The "Light side, heart of worlds Keyblade" that Sora wields, the "Keyblade of people's hearts" made from the Seven Princesses' hearts for Riku, and the "Dark side, heart of worlds Keyblade" that the king obtained in the realm of darkness, presently these 3 types can be confirmed. Could you please explain things a little further?
The Keyblade constructed from the Seven Princesses' hearts that Riku obtained in the previous game allowed for the Keyhole in Hollow Bastion to appear. For the plan to cause darkness to overflow from hearts, the special hearts held be the Princesses were used to artificially make this Keyblade. So it is different from a proper Keyblade. There are further suggestions that this Keyblade is artificial as well.