The most formal way of saying thank you would be: Domo arigatou gozaimasu [Formal way of saying thank you very much]
Informal would be: Domo arigatou [Thank you very much]
Or just thank you would be: Arigatou
And Gozaimasu is just a fragment that they put in front of something that is formal.
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That is usually a scam when people say that kind of stuff, they are just trying to scam you into getting that much money when really you'll get something else or it might be fake money or something.
Did you mean what does it mean in Japanese? I think it means "That is" because when it's with "Desu", it means, "That is so."
No, I don't believe that there is an online game for Kingdom Hearts. But that would be really cool if you could pick your own character or make your own from scratch. You know?