Hello again! By the way, I’m always open to different types of puzzles; feel free to contact me with any ideas you may have.

The next entry is based on Yajilin. As part of his homework, Peter Hawkeye must create an electric circuit that lights up a series of blue LEDs. His goal is to trace a continuous loop of wire around a grid, which must meet the following requirements:

• The loop starts and ends at the cell marked with a flag. When the loop approaches each cell, it can pass straight through or make a 90-degree turn.
• Cells with numbered arrows indicate how many LEDs lay in that row or column. LEDs can also be placed in cells where there are no arrows pointing toward it.
• LEDs cannot be placed directly next to each other (diagonal is okay).
• The loop must pass through every cell that is not an LED or a numbered arrow. Branches or overlaps are not allowed.

The pictures below depict a sample puzzle on a 5×5 grid, along with its solution. The turquoise lines in the solution represent the wire loop, and the brown cells represent the placed LEDs. Note that the LED in the center does not have any arrows pointing toward it.

Now, can you solve the puzzle below and help Peter create his circuit?

The solution will be released in the next blog post. Also, if you tried the puzzle from the last blog entry, here is its solution below. Piece of cake, right?