Grid-based puzzles are games or challenges that use a grid layout, typically consisting of rows and columns. Players must fill in the grid according to specific rules or clues, often involving logic and deduction. Common examples include Sudoku, crossword puzzles, and nonograms. These puzzles can vary in complexity and size, appealing to a wide range of skill levels. They often require critical thinking and problem-solving skills, making them popular for both casual and serious gamers. Many grid-based puzzles are available in books, newspapers, and online platforms, providing endless entertainment and mental exercise.