The idea of the game is straightforward - go ahead and have "SUM FUN"! Use the tiles you have picked up to make SUMs. Once all of the tiles are out, the winner is the first person to use all of their tiles to make valid SUMs. The SUMs must be connecting and intersecting - similar to that of a crossword format. A player can rearrange their own SUMs as often as they wish. Everybody plays the game at the same time, there is no waiting around for another player to take their turn as each person makes their own SUMs independently from one another. Product contains 190 tiles (103 number tiles and 87 symbol tiles) in a blue canvas case along with instructions.