The solving of puzzles - i.e. toy problems designed to test ingenuity - should not be considered on-topic.
Simply finding the answer is not the role of this site, even if the puzzle itself may be notable - e.g. Rubik's Cube or any of those interminable arithmetic questions that create a buzz by revealing people's ignorance about the order of operations in arithmetic.
Finding solutions may be on topic at Puzzling Stack Exchange.
Puzzles may still be on-topic here in at least a couple of ways.
There may be claims about the puzzle - e.g. that the Riddle of the Sphinx originated in Ancient Egypt.
There may be claims about the answer - e.g. an answer declared to be right on a trivia quiz show like QI - which is based on doubtful facts.
Both of those are claims that amenable to answering based on the application of scientific skepticism. However, simply linking to a puzzle and asking for the solution is not.