Following

you copied half of message

So, 3*4=72 ?

Because the bug can't fly.

Note: The bug cannot fly and has to maintain contact with a surface at all times but can walk up walls.

Can't understand the idea of kata, why we can't go through the diagonals. It is the shortest way. In first test I got 3.74

Test solve([[1,2,3],[3,4,6,6,7],[8,9,10,12,5,6]]),72) have a bug.
If we use a little combinatoric knowledge and some fingers we will see this bug.
Original values in each array: [3,4,6] Ok, let's multiply them, result 3 * 4 = 12 * 6= 72.

• 1 * 4 * 6 + 1 * 4 * 6 + 1 * 4 * 6 =72
  But [1,2,3], [3,4,6,7],[8,9,10,12,5,6]
  [1,3,[8,9,10,12,5,6]] = 6 23+23+17
  [1,4,[8,9,10,12,5,6]] = 6
  [1,6,[8,9,10,12,5]] = 5
  [1,7,[8,9,10,12,5,6]] = 6
  This is why, result( 23+23+17) should be 63

The perfect square for 9 is 16, 9+7, why we should add 16?

It isn't right description