In a recent post-E3 interview with Square Enix, Kingdom Hearts game director Tetsuya Nomura has revealed that the graphics in the new Kingdom Hearts HD 1.5 ReMIX had to be remade from the ground-up due to the original assets for the 11-year old title had being lost.

"Kingdom Hearts 1 was created a long, long time ago, so actually the original data was missing already," Nomura said. "It was lost, so we had to research, and we had to dig out from the actual game what was available and recreate everything for HD. We had to recreate [the] graphics and it was actually not that easy."