Where can I find the notes to play on the piano for a certain song, without reading the sheet music?

I'm trying to learn to play "The Promise" from Final Fantasy XIII
(Serah's Theme), but I can't read the confusing music sheet.

I found this website,
http://tabnabber.com/view_Tab.asp?tabID=16686sArtist=Final+Fantasy+13sName=Serah's+Theme

But it's not very accurate, does anyone know where I can find the
notes like this?