Scrabble variants the winner. In others, a calculation based on word length is used to determine the winner. Some variants allow for the exchange of unwanted tiles. Local variants include Take One or Take Four; the banning of 2 letter words; having a dictionary on hand for any players to use (but since it is a game of speed, this doesn't get used much); a bonus of 50 points for building the word "chicken", a bonus for longest word (number of letters in word, not tile values; and only if a single player has longest word), etc. Team Speed Scrabble is when
Tile-matching video game game mechanic, rather than a distinct genre of games. The mechanism of matching game pieces to make them disappear is a feature of many non-digital games, including Mahjong solitaire and Solitaire card games. Jesper Juul traces the history of tile-matching video games back to "Tetris" and "Chain Shot!", published in 1984 and 1985. While both focus on pattern matching, they differ in important design points such as time pressure, tile manipulation and match criteria. A second generation of influential matching games – "Puzznic", "Columns", "Dr. Mario" and "Plotting" – was published in 1989 and 1990. Games building on "Dr. Mario"'s