The text adventure genre started by Crowther and Woods' Colossal Cave adventure in 1972. "Text Adventures" is often used interchangeably with "Interactive Fiction". Playing text adventures involves typing plain English and reading textual responses, although it is not uncommon to find graphics inserted with the text, or commands given by the mouse. The genre has blossomed to include a huge variety of games: difficult puzzles or no puzzles; inspired, evocative, funny, or terse writing; and also a few arcade games. More games are available every week, and there is an Interaction Fiction Competition every year. This category includes illustrated text adventures with a command line interface.