The walkthrough has been divided up by rank. The walkthrough assumes normal difficulty setting. The storyline is the same on both settings, and the same general tactics should be applicable. Normal difficulty will give you some time to learn the game, which you don't get on the hard setting. Timings are approximate - this partly depends how quickly you respond to missions and events. One important tip: Make regular saves using different save slots, so that when things go wrong you can restart a day or week or more beforehand with the benefit of hindsight. This will save a lot of frustration caused by needing to restart the game from the beginning.
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