 It was revealed in March 2013 in a Famitsu interview , that 66 tracks spanning across all three games ( with a majority of them concentrated in Kingdom Hearts Final Mix ) were re @-@ recorded with live instrumentation , as opposed to the original games ' use of the PlayStation 2 's built @-@ in tone generator for their background music . In June 2013 , Nomura stated that the original game assets for Kingdom Hearts had been lost some time ago . He explained , " [ The game data ] 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 all the graphics and it was actually not that easy . " 
