Tips for Christmas Tree Light Up
There are a few simple rules for you to follow:
- The correct solution will not have open ends, nor will it have loops.
Start from the edges, e.g.:
A cross must have all the adjacent blocks point to it:
Keep in mind the blocks which you are certain about their orientation, e.g.:
The highlighted block can have a number of different orientations:
But if you know that the orientation of the bulb is correct, then the highlighted block can only be oriented as follows: