You must place the number 1 to 16 in the grid such that:

An even number N must be placed in the same row or column as N-1.

An odd number M must be placed in the same diagonal as M-1.

(So if you were to trace the paths from 1 to 2, on to 3, etc all the way to 16, you would be alternating between rook moves and bishop moves).

All of the inequalities are correctly observed.

If the inequality is red, the numbers concerned are consecutive numbers.

A red X means that one or other of the pairs of numbers diagonally adjacent to the X are consecutive numbers.