Knock knock yeah four letter puzzle

Each letter of this four-letter puzzle is its own individual puzzle, so when you complete every one, you'll spell out a favorite four-letter word Approximately 500-piece puzzle with gold foil Jigsaw puzzles that spell it out for you - in this case, y-e-a-h Need birthday gift ideas for a puzzler? the search is over Knock Knock is an independent maker of clever gifts, books, and whatever else they can think up; their mission is to bring humor, creativity, and smarts to everyday life