Scrabble Showdown set of 16 letter tiles are placed on the board. A randomizer then causes tiles to light up. Each team is allowed to stop the randomizer; a team starts the final round with the regulation value of the tiles that they stop the randomizer on; the number of tiles that the randomizer lights up is the number of "Bonus Scrabble Tiles" that the team had earned from the three previous rounds. This becomes their "head start" score before playing "Scrabble Lightning". The game is played on a regulation Scrabble board with only the double and triple-word score spaces (the double
English-language Scrabble also carry significant prize money. The official dictionary is the Official Tournament and Club Word List. When a player challenges a word he considers to be invalid, if the word is invalid it is removed from the board with a score of zero. However if the word is valid, the player who challenged the word loses his turn. Scrabble clubs are also run that meet on a regular basis, usually weekly or biweekly at the same venue. Players usually play a smaller number of games than they would play at a tournament. Match play Scrabble is also practised at tournament