Sunday Times Teaser 2579 – Box Clever
by Victor Bryant
Published: 26 February 2012 (link)
I have placed the digits 1 to 9 in a 3×3 grid made up of nine boxes. For each two-by-two array within the grid, the sum of its four entries is the same. Furthermore, if you reverse the order of the digits in that common total, then you get the sum of the four corner entries from the original grid.
Which digits are adjacent to the 6? (ie whose boxes have a common side with 6’s box?)