Tips for Christmas Tree Light Up

Simple Rules

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:

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