Write the numbers 1 through 8 in the circles so that no two numbers inside circles joined by a line differ by 1.

Here is an example of an incorrect solution (because 3 is linked to 4 and 6 is linked to 7):

Extensions:

Choose one of the four diagrams below. Try to write the numbers 1 through 9 in the circles so that no two numbers inside circles joined by a line differ by 1.

Two of the diagrams are impossible and two are possible - which ones?

Make your own digit placing puzzle using the digits 0 through 9, but don't allow the 0 and 9 to be side by side.

Two Player Game:

Players take turns placing the digits in a diagram. The first player who cannot place loses.

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