Short answer: 2,875,578. That's what I needed and I picked the shield at the start. It may be different depending on what you select at the start, but that's the best I can say.
Yes. At E3, two Kingdom Hearts titles were announced; Kingdom Hearts 3D and Kingdom Hearts RE: Coded. Not much information is available regarding Kingdom Hearts 3D, but it will be for the Nintendo 3DS and will utilize the 3DS's new 3D feaures. Kingdom Hearts RE: Coded is just Kingdom Hearts Coded, remade for the Nintendo DS.
Use final form as much as possible, you will level up and eventually get the glide ability for Sora.
Play a different game or play it on another level to challenge yourself. Try playgin Kingdom Hearts 1 on a harder level or just play it. You can't really do much after you beat KH2...
Kingdom Hearts 2 came out almost 4 year after the original. I say that both story are interesting, but the graphics and depth of the stories in Kingdom Hearts 2 is much better than that of Kingdom Hearts. Also in the 2nd kingdom hearts you get better keyblades, clothes and you meet a bunch of new friends like mulan, axel, pete, belle and many many more
1000 hearts i believe
Sora, Riku and Kairi are in Kingdom Hearts III. Kingdom Hearts Birth By Sleep is the game that you are most likely referring to, which introduces new characters and events that happen 10 years previous to the first Kingdom Hearts. The trailer for Birth By Sleep was shown as a secret video at the end of Kingdom Hearts II, and is commonly thought to be Kingdom Hearts III but this is not the case. In an interview with Tetsuya Nomura (Director/Character Designer for the Kingdom Hearts series) he states that Birth By Sleep is "episode 0" because it holds as much importance as Kingdom Hearts and Kingdom Hearts 2, but is NOT Kingdom Hearts 3. Kingdom Hearts III was confirmed by Tetsuya Nomura in the same interview saying that he will start working on Kingdom Hearts 3 once the Final Fantasy XIII side-games are completed.~I hope that this clears up all of the confusion and arguing. -RoxasDive
Kingdom Hearts: Dream Drop Distance is an upcoming game in the Kingdom Hearts series. It is currently in development and will be released for the upcoming Nintendo 3DS system. It will continue the story of Kingdom Hearts after the latest game, "Coded". There is not much information about it yet, but it will supposedly return to the main storyline with Riku and Sora and lead into Kingdom hearts 3.
Depending on it's condition 15-30$
$40 in U.S.