Scrabble
Gameplay

On every turn, the player at turn can perform one of the following options:

The first play of the game must consist of at least two tiles and cover the center square (H8). Any play thereafter must use at least one of the player's tiles to form a "main word" (containing all of the player's played tiles in a straight line) reading left-to-right or top-to-bottom. Diagonal plays are not allowed. At least one tile must be adjacent (horizontally or vertically) to a tile already on the board. If the play includes a blank tile, the player must designate the letter the blank represents; that letter remains unchanged for the rest of the game unless the play is challenged off. The player announces the score for that play, and then draws tiles from the bag equal to the number of tiles played, so that there are 7 tiles on their rack. If there are not enough tiles, the player draws any remaining tiles instead. If the game is played using a clock, the player starts the opponent's clock after announcing the score and before drawing tiles.

If a player has made a play and not yet drawn a tile, any other player may choose to challenge any or all words formed by the play. The challenged word(s) are then searched in the agreed-upon word list or dictionary, and if one or more of them is found to be unacceptable, the play is removed from the board, and the player scores zero for that turn. If all challenged words are acceptable, the challenger loses their turn. In tournament play, players are not entitled to know which word(s) are invalid or the definitions of any challenged words. Penalties for unsuccessfully challenging an acceptable play vary in club and tournament play and are described in greater detail below.
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