A typing game is a genre of video games that involves correctly entering letters, words, or sentences on the keyboard. It began as a sub-genre of educational games designed to familiarize players with keyboard use and to improve skill at touch typing. Successfully typing a letter or word is tied to an action, such as firing a weapon at an attacking space ship. Companies associated with video games, like Broderbund, Atari, Inc., and Sirius Software all released typing games in the early 1980s. More formal educational software like Mavis Beacon Teaches Typing (1987) incorporates minigames as a practice option. Some later games, like Type Rush, add online competition based on players' typing speeds, making typing more addictive.