Step By Step/en
Starting with 1, fill the whole grid with numbers 1-n, jumping between the squares in any one of the four directions. If you are on an odd number, you must jump one cell away (to one of the adjacent cells). If you are on an even number, you must jump two cells away (only in one of the directions). You should follow the route 1, 2, 3, ......, n. Your route may not leave the grid at any time, and you may not use the black squares as part of your route.