Place the digits 1 to 9, once each, into every row and column. No digit shares an edge with a consecutive digit. Each straight line is a palindrome. (So eg r3c1=r4c2 so that that straight line would read the same from either direction.)
Place the digits 1 to 9, once each, into every row and column. No digit shares an edge with a consecutive digit. Each straight line is a palindrome. (So eg r3c1=r4c2 so that that straight line would read the same from either direction.)