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Originally Posted by Sleepy
Zork Grand Inquisitor: The sluce-gates puzzle (where all the sluce-gates have to be closed) Spoiler:it's impossible to close all the sluce gates at the same time-- the solution is to use a spell which makes it possible. (I spent ages on this puzzle trying to close the gates and couldn't work out why I couldn't solve it (up to that point I'd unsuccessfully tried spells on almost everything apart from that puzzle)
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The most basic maths shows that you cannot solve it only pressing the buttons,
Spoiler:while every push changes state of exactly two gates. So you'll never get from odd to even number of closed gates.
Not that I saw it right away, but it was far from unfair.
