Random Puzzles 

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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Which of the shapes is identical to the first one?

There might be more than one.

Puzzle Copyright © Robert A. Hartmann

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In each of these sentences, can you replace the missing number.

The number is written as a word (e.g. five, twenty-four, thirty-three), and each sentence is correct after the replacement.

This sentence contains exactly ? E's and not one more.
However, this sentence contains exactly ? S's, with a single Z.
Finally, to finish, this sentence has exactly ? I's.

Puzzle Copyright © Kevin Stone

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How many squares, of any size, can be found on a standard chessboard?
How many rectangles, of any size, can be found on a standard chessboard?
Remember when counting the rectangles, that squares are also rectangles.

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