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Hard Puzzles


Difficulty: HardPuzzle 21

You have 12 coins, one of which is fake.

The fake coin is indistinguishable from the rest except that it is either heavier or lighter, but you don't know which.

Can you determine which is the fake coin and whether it is lighter or heavier using a balance scale and only 3 weighings?

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[Ref: ZLKY]

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Difficulty: HardPuzzle 22

Puzzle IconWhat four related words are merged here:

SWAS PURI UINM NTTU MGER MNER

[Ref: ZAAF] © Kevin Stone

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Difficulty: HardPuzzle 23

In this long division, each number has been replaced by another. The answer has also been removed. Can you determine the answer?

       ****
     ------
75 | 796767
     791
      --
       57
       30
       --
        86
        82
        --
         47
         47
         --
          9

[Ref: ZUKF] © Kevin Stone

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Difficulty: V.HardPuzzle 24

Below is a very special grid, around each shaded number are 8 white squares. However, each white square should have a number from 1 to 7. Once filled in, these 8 numbers will sum to the shaded number. In addition, once completed correctly, no row nor column will contain a duplicate number within a white square. For example, the top row may be 5 6 4 2 3 1 7, etc. This is a very difficult puzzle, and many people resort to using a computer to help them, which is a challenge in itself.

Puzzle Image

[Ref: ZIWB] © Kevin Stone

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