Scrabble rotating mechanisms and personalized graphics. An edition has been released (in association with the RNIB) with larger board and letters for players with impaired vision. The colours on the board are more contrasting and the font size is increased from 16 to 24 point. The tiles are in bold 48 point. An introduction to tournament "Scrabble" and its players can be found in the book "Word Freak" by Stefan Fatsis. In the process of writing, Fatsis himself progressed into a high-rated tournament player. The "Scrabble Player's Handbook", edited by Stewart Holden and written by an international group of tournament players,
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