Hard Puzzles 

What four related words are merged here:
SWAS PURI UINM NTTU MGER MNER

Puzzle Copyright © Kevin Stone

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In this long division, each number has been replaced by another.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

Puzzle Copyright © Kevin Stone

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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 Copyright © Kevin Stone

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This multiplication contains the numbers 1-9. Can you complete it?
 ...
  3. x
————
....

Puzzle Copyright © Kevin Stone

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