Instructions: Draw a 3x3 grid. Then arrange the numbers 1 through 9 in the grid so that all of the conditions in the puzzle are satisfied.
The number in the lower left corner is 4 times the number in the upper right corner.
The 9 is between the 5 and the 8. (on a straight line)
There is a column in which the sum is equal to the product.
The 4 is between the 9 and the 3. (on a straight line)
No prime number is immediately to the left of a prime number.
The number in the lower left corner is the sum of the numbers in all the other corners.
There is a column with a sum of 10.
No even number is immediately to the left of another even number.
One row has a product of 30.
There is a row with a sum of 21.
No odd number is immediately below another odd number.
There is a row, column, or diagonal in which the sum and the product are equal.
4 is between 2 and 5.
6 does not share a row, column, or long diagonal with 7.
3 is between 4 and 8.
The sum of one of the long diagonals is odd.
There is a number in the left-hand column that is 3 times the number in the lower right corner.
3 does not share a row, column, or long diagonal with 1 or 4.
The bottom row has a sum of 20.
The column on the right has a sum of 7.
There is a row which contains only prime numbers.
The column on the left has a sum of 16.