We claim the ornamental design for a set of markings for a game ball, as shown and described.
FIG. 1 is a front view of a game ball including the markings;
FIG. 2 is a left side view of the game ball of FIG. 1; and,
FIG. 3 is a right side view of the game ball of FIG. 1.
The ornamental design that is claimed is shown in solid lines in the drawings. The broken (dashed) lines shown in FIGS. 1 through 3 are included for the purpose of illustrating environmental elements only and form no part of the claimed design.