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Theme: One-Way Arrows
Author/Opus: This is the 170th puzzle from guest contributor Prasanna Seshadri.
Rules: Place some of the given pentominoes in the grid so that no pentominoes touch, not even diagonally. Pentominoes cannot repeat in the grid; rotations and reflections of a pentomino are considered the same shape. The arrow clues indicate all the directions (up, down, left, and right) where the nearest pentominoes are located when looking from that square. Also, see this example:
Answer String: Enter the length in cells of each of the shaded pentomino segments from top to bottom for the marked columns, starting at the top. Separate each column’s entry from the next with a comma.
Time Standards (highlight to view): Grandmaster = 6:00, Master = 10:45, Expert = 21:30