With the absence of any kind of in-game map system, I'm thinking I will pick up a Prima Guide this time around, (and I NEVER buy the Strategy Guides.)
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If you know where everything is at then it takes the fun out of exploring I never view any material (like the ghost locations in this game) I'm playing until I've beat it and have found everything I could on my own (sorry but trying to check every inch of every location gets a little boring). By then you can find a hundred videos on youtube for whatever you're looking for.