>>11560438It can only work as a hint as long as the puzzle is meta. If a puzzle has multiple solutions, then saying the puzzle has a unique solution is a lie
If the puzzle has no solution, then saying the puzzle has a unique solution is also a lie
If the puzzle has one solution, then the hint wouldn't give you any information you didn't already have. However, if part of the puzzle is selecting the puzzle itself (from a list), then the hint would help.