The cheats recommended in postgame seem to be a little finicky. I think part of it is that when you're told about the cheats, they're capitalized but pressing shift seems to make it not work. It also feels a little weird that even after the catastrophe is taken care of, moving around the map still drains my battery but you're given a full charge upon entering postgame and you only really lose charge when switching islands so that doesn't matter. I will ask this though, according to the guide there's a secret scene that requires you to have all hints to unlock. I beat the game with only 3, am I locked out forever? Do I have to play the whole game again from the beginning to get it?