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 variants no premium squares (originally 64 tiles on an 8×8 board). It has a Qu tile instead of Q and a different tile distribution than Scrabble. Words can be formed as in Scrabble as well as by playing on top of previously formed words. When playing over a word, at least one tile from the original word must be incorporated into the new word. All tiles, with the exception of the Qu tile in certain circumstances, are worth the same, with additional points scored for higher stacks of letters. Stacks can't go higher than five tiles and all words that are