http://krazydad.com/slitherlink/sfiles/sl_penrose_b001.pdf
Years ago, I sought (and received) permission from Penrose to use his tiling on these puzzles.
Play it here: http://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/loopy...
You can play penrose style puzzles by selecting the type in the furthest right drop down menu.
(beware, select custom and choose easy mode, becuase hard mode is hard)
http://krazydad.com/slitherlink/sfiles/sl_penrose_b001.pdf
Years ago, I sought (and received) permission from Penrose to use his tiling on these puzzles.