Pentatouch by Serkan Yürekli
or solve online (using our beta test of Penpa-Edit tools).
Theme: Wide Open Corner
Author/Opus: This is the 83rd puzzle from our contributing puzzlemaster Serkan Yürekli.
Rules: Place the twelve pentominoes into the grid, rotations and reflections allowed. Pentominoes can touch each other only diagonally. All places where pentominoes touch are marked with a dot.
Or see this example:
Answer String: Enter the length in cells of each of the pentominoes 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 = 3:00, Master = 3:30, Expert = 7:00
Solution: PDF
Note: Follow this link for other puzzles involving Pentominoes.