Scrabble of points for each lettered tile is based on the letter's frequency in standard English; commonly used letters such as vowels are worth one point, while less common letters score higher, with Q and Z each worth 10 points. The game also has two blank tiles that are unmarked and carry no point value. The blank tiles can be used as substitutes for any letter; once laid on the board, however, the choice is fixed. Other language sets use different letter set distributions with different point values. Tiles are usually made of wood or plastic and are square and thick,
Scrabble is allowable in ordinary Scrabble, EEAIORT would be allowable in Clabbers. A junior version, called "Junior Scrabble", has been marketed. This has slightly different distributions of frequencies of letter tiles to the standard "Scrabble" game. Word games similar to or influenced by "Scrabble" include Bananagrams, Boggle, Dabble, Nab-It!, Perquackey, Puzzlage, Quiddler, Scribbage, Tapple, Upwords, and WordSpot and also Words of Gold. There are also number-based variations, such as Equate (game), GoSum, Mathable, Numble, Numbler, Triolet, Yushino and Numenko. The game has been released in numerous gameboard formats appealing to various user groups. The original boards included wood tiles and many