Incredible series, you made a very good decision. The following is a mechanic spoiler rather than a plot one, but I'll clarify how the morality system works. [spoiler]Make sure you listen to NPC conversations, play instruments and explore everything. That's how you gain morality points (the screen will flash when you gain one or briefly flicker black-and-white when you lose one), which will determine whether you get the good or bad ending in each game. As far as I'm aware, no one knows how many or what combination of points is necessary for either ending. This system is never explained in-game and doesn't work like how Mass Effect does, for example. It's more based on how much you interact with the game itself rather than whether you hit the red or blue button in conversation minigames. [/spoiler] I would personally recommend playing the games in order, but it's not that big a deal if you don't.