Griddlers, also known as nonograms or picross, are logic puzzles that involve filling in a grid based on numerical clues. Each number indicates how many consecutive squares in that row or column should be filled. The goal is to reveal a hidden picture by correctly interpreting these clues. Players use deduction to determine which squares to fill and which to leave blank. The puzzles vary in size and difficulty, making them suitable for all skill levels. Griddlers can be found in books, newspapers, and online, appealing to puzzle enthusiasts and casual gamers alike.