Theme: Clue Symmetry and Logic (originally on 2016 Polish Puzzle Championship)
Author/Opus: This is the 119th puzzle from our contributing puzzlemaster 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, ignoring the clue cell itself. (Pentominoes can sit on the clue cells.)
See also this example:
Answer String: Enter the length in cells of each of the shaded pentomino segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma.
Time Standards (highlight to view): Grandmaster = 3:15, Master = 4:00, Expert = 8:00