Nonograms, also known as griddlers or picross, are logic puzzles that consist of a grid filled with cells. The objective is to color in the cells based on numerical clues provided for each row and column. These clues indicate the lengths of consecutive filled cells, helping players deduce which cells to fill in to reveal a hidden picture. To solve a nonogram, players must use deductive reasoning to interpret the clues. For example, if a row has the clue "3 1," it means there is a sequence of three filled cells followed by at least one empty cell, then a single filled cell. By applying these rules systematically, the entire grid can be completed.