The numbers 1 up to 12 must be placed in the circles of the star shown below. The sums of the numbers in each row, and the sum of the numbers in the six outer circles of the star, must be equal 26.

The question: How must this be done?

The answer: Click here!

Another question: In the figure below there are six curves (with different colors) that each connect four circles. The numbers 1 up to and including 16 must be entered in the circles in such a way that the sum of the circles on each of the six curves is 34.

How can you solve this?

Another answer: Click here!