I can't imagine having the patience to lvl up so much in that game where the graphics are so boring and simple. NES music can give you a headache. The PSX version I think lets me play much longer, and my brain doesn't react to it afterwards. Playing old games for so long, my brain used to involuntarily play back sound effects and musical notes, but that doesn't happen on more advanced systems. If you're going to play FF1 for a long time, the PSX version is the healthy alternative. However, I'll add the new game boy version to my wish list since there's more extras in it.