Take a look at the logo for each game. They all say KINGDOM HEARTS over the heart symbol with the subtitle under it. I find it interesting that the style of the fancy letters in KINGDOM HEARTS is the same for KH1 and COM, then changes slightly for KH2. Days, BBS, and coded were announced at the same time. BBS and Days have yet another slight font variation, while Coded, and now 3D have reverted back to the style used in KH2. Does anybody think there is a reason why certain titles use these variations, and if there is some sort of connection between the titles which share the same writing. they would be grouped as:
-KH1, COM
-KH2, Coded, 3D
-BBS. Days
-KH1, COM
-KH2, Coded, 3D
-BBS. Days