Each tile (each letter) has a number of points. The common letters such as A, B, T, etc. are worth one point. Unusual letters such as Q and Z are worth 10 points. There are also two blank tiles which can be used for any letter. A player must say what the letter is when he puts it down, e.g. he might say that "C" "A" "Blank" spells "CAT". During the rest of the game that blank tile must be treated as a letter "T".