Cast Hourglass | Designers | Puzzle Master Inc

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Monday December 23rd Alexander Markevitch wrote,
Hourglass is the epitome of a puzzlers dream.
Friday February 1st Rage wrote,
This puzzle is, in my opinion, Hanayama's hardest without a doubt. Each move requires one to think almost completely backwards to how you think it "should" work, and then to align the pieces with careful precision to execute it. I was able to disassemble this beast after many many hours of working on it, but the reassembly proved too much. If you thought Vortex, Quartet, or Trinity was hard to put back together (and yes I have solved those), this one is worse by a lot. After more hours than I would care to mention I was hopelessly lost in the countless dead ends of the reassembly and had to resort to YouTube.. oh the horror! Jin-Hoo Ahn, my hat is off to you for creating a puzzle that even I thought was too hard. This puzzle definitely belongs in every serious puzzler's collection, I highly encourage you to pick up your copy now!