I claim the ornamental design for a ring device for a ring toss game, as shown and described.
FIG. 1 is a front, top perspective view of a ring device for a ring toss game according to the design;
FIG. 2 is a top view thereof, the opposite side being a mirror image thereof; and,
FIG. 3 is an alternate view showing the article in a state of use, in which the game base and human figure is shown demonstrating the method of play.
The broken lines showing the game base and human figure are provided for the purpose of illustrating environmental structure and forms no part of the claimed design.