Each played tile is the solution to an arithmetic equation containing two adjacent tiles, such that a line of three numbers is formed. For example, a sequence of an 8 and a 2 on the board may have either a 4 (division), 6 (subtraction), 10 (addition), or 16 (multiplication) played next to it. The position of the played tile may be either to the right or left of the adjacent tiles for a horizontally-oriented equation (representing either 10 = 8 + 2 or 8 + 2 = 10), or either above or below the tiles for a vertical orientation.