Leave the world (ie travel to traverse town) and go back
Leave the ENTIRE world and then come back
Kingdom Hearts is the collection of hearts that the Organization XIII has, they are the hearts that Sora took from the heartless, the hearts rose up from the dead heartless and went to Kingdom Hearts, which is in The World That Never Was.
Nope.
I'm not sure but i would guess that sense the keyblade is basicaly the only thing that can kill nobodies and when someone becomes a heartless a nobody is created and everytime the keyblade kills a heartless a hearts is sent up to the kingdom of hearts. and the members of organization 13 need kingdom hearts to become whole. so the keyblade is used to shut the door to darkness and to OPEN the door to LIGHT.
The Trickmaster is a boss villain in the Kingdom Hearts games, found in the Wonderland. He is a Heartless.
I think to keep the trapped hearts inside
You have to find lots and lots of heartless.
They are heartless. Tough, tremendously strong heartless. Watch Out!! :D
They are Pureblood, meaning they are the original Heartless that weren't people missing hearts. They are monsters such as Darksides and Shadows that never needed a person without a Heart.
You battle them
Kingdom Hearts 2 is the sequel of Kingdom Hearts, in Kingdom Hearts 1, it was just about Heartless and killing Ansem for the final fight to end the Heartless' attacks for hearts. In Kingdom Hearts 2, it has Heartlesses and Nobodies, the empty shells of the bodies that the Heartless have the taken the heart from. The final fight in Kingdom Hearts 2 is Xemnas, ironically, the Nobody of Ansem, which is a Heartless. In Kingdom Hearts 2, Sora gets taller, so he gets new clothes, new Keyblades, new abilities and all sorts. But the overall way of playing and story is the same. Go to worlds of all sorts from Disney to kill Heartless and Nobodies to eventually meet Organisation XIII, the leader of the Nobodies and fight Xemnas, the leader.
Axel's Heartless has never been mentioned or revealed in any Kingdom Hearts title.