This file includes the game board and directions. Here's how to play: Players use cubes in two different colors. The first player chooses two addends (from 1-13 underneath the game board), places a paper clip on each, and marks the sum on the game board with a cube. The second player moves one of the paper clips to a new addend, finds the sum, and marks the sum with a different color cube. Play continues until one player has marked four sums in a row, a column, or a diagonal. Note: It is legal to move a paper clip to the same addend of the other paper clip to allow for doubles such as 6 + 6.