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If you are a completionist like me with OCD, you'll want to do it all. Here are some good examples that take up a great deal of time.
RE Mercenaries 3D: Dead Rising Medal MK7: 10K VR/Coins, 3 Star Rank NSMB2: 1 million coins, 5 star file KI Uprising: All 3 Treasure Hunt checklists DOAD: Figurines and costumes (some only through Spotpass that could take weeks or months)
Anyone have any tedious challenges that would like to share?