Scrabble have been sold worldwide and roughly one-third of American and half of British homes have a Scrabble set. There are around 4,000 Scrabble clubs around the world. The game is played by two to four players on a square board with a 15×15 grid of cells (individually known as "squares"), each of which accommodates a single letter tile. In official club and tournament games, play is between two players or, occasionally, between two teams each of which collaborates on a single rack. The board is marked with "premium" squares, which multiply the number of points awarded: eight dark red "triple-word"
Scrabble variants a player before his turn can pick up the blank and replace it by the letter that it represents. For example, if the word STRETTa is on the board (with a blank A), the player may pick up the blank and replace it with an actual A. However, he cannot replace it with an E, I, or O to produce STRETTE, STRETTI, or STRETTO. Solitaire Scrabble follows the same rules and word acceptability as normal Scrabble, but there is only one player. Solitaire Scrabble can be played against a clock, trying to get the most points in a certain length