If you start at the bottom-right you can count either up or left. Going 8 places up lands on an 8 (this is the only square where delta from bottom right = numbe

If you start at the bottom-right you can count either up or left. Going 8 places up lands on an 8 (this is the only square where delta from bottom right = number in the square) which means that square was the previous one. Rinse and repeat.