I have both the jap and us SOTN. They aren't hard at all to get
its harder to get them in the uk, especialy since i had to gwt a us copy with crazy delivery costs. it isnt the hardest game to get, but i gots it.
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Its only taken me about 10 years to understand the water jug riddle in Die hard with a Vengeance. My brain takes a while, but it gets there in the end