 There are special blue squares scattered throughout the board which contain an arithmetic symbol (a plus, minus, multiplication, or division sign), as well as premium squares labelled as 2x (green) and 3x (red).There are 108 tiles included with the game, 2 of which are blank and can be used as replacements.Of the 106 playable tiles, there are seven each of the numbers 1 through 10, one 0, one each of the numbers 11 through 20, and one each of every number between 20 and 99 that can be represented as a multiplication of two numbers between 1 and 10 (for example, 21, 24, 25).