A puzzle in which you spot the pattern that links a set of given data items (like numbers, letters, music tunes). Usually, you use your insights into the pattern to find one or more new elements of the set.
This tag is for puzzles where one is given a set of objects and is required to find common characteristics between them - this is called the pattern.
One is then usually required to find new elements of the set that follow this pattern.
Examples of pattern puzzles include: