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A puzzle involving a set of things (most often words) which must be divided into groups such that the things in each group share some connection.

A puzzle involving a set of things (most often words) which must be divided into groups such that the things in each group share some connection.

Based on the BBC game show 'Only Connect'.

Usually there is a $$4\times4$$ grid, and the things must be split into $$4$$ groups. But beware because there are usually lots of red herrings! There are $$\dfrac{16!}{4!^4}=63,063,000$$ possibilities per grid.

Examples:

• A wall using words
• A wall using cryptic clues
• A wall using lines of music
• A wall using rebuses

Additionally, between Nov. 1 and Nov. 14 of 2020, there was a Fortnightly Topic Challenge for Wordless Connecting Walls. The link-collecting answer there has many links to creative interpretations of the connect-wall genre.

Those interested in creating their own, hard, connect-walls may want to read this question and its answer on how to do that.