A tough puzzle is a challenging mental exercise that requires a person to think critically and creatively in order to solve it. It can be a crossword, anagram, or any other type of puzzle. The solutions for the term 'tough puzzle' are TEASER (6 letters), ENIGMA (6 letters), POSER (5 letters), STUMPER (7 letters), BAFFLER (7 letters), and STINKER (7 letters). A TEASER is a type of puzzle that requires a person to think outside the box in order to solve it. An ENIGMA is a type of puzzle that is difficult to solve due to its complexity. A POSER is a type of puzzle that is designed to test a person's knowledge. A STUMPER is a type of puzzle that is so difficult that it is almost impossible to solve. A BAFFLER is a type of puzzle that is designed to confuse and frustrate the solver. Finally, a STINKER is a type of puzzle that is so difficult that it is almost impossible to solve.