The following puzzle contains no hints. It is a rare pattern with only one structural solution (+ the complementary number solution of course). So all one has to do is to select a proper cell which cannot have the value 5 and put either the low values or the high values into it.
I highly recommend using H5 with the low values 1,2,3,4. Then the puzzle solves surprisingly easy; no chains are needed. The link also contains the H5=low solution.