A word game is a game that uses words, letters, sentences or other parts of a language. They are often board games, but are not necessarily; for example, Scrabble Slam does not use a board. Wordplay is often classified with word games.
One of the first known instances of wordplay is the so-called Sator Square. This was found in an inscription in Herculaneum. It contains five words, each of five letters:
Anagrams were popular in Roman times and the Middle Ages and are still popular today. Crosswords were invented in 1913 and Scrabble in the 1930s ('31 or '38 - the precise date varies depending on the source). Many other word games have become popular more recently, such as Boggle and Scrabble Slam - and of course, nowadays these all have online counterparts.