The ornamental design for a gameboard, as shown and described.
FIG. 1 is a top plan view of a game board, showing our new design, the
bottom being plain and unornamented;
FIG. 2 is a side elevation view thereof, the other sides being identical;
and,
FIG. 3 is an enlarged partial top plan view of the central region and of a
typical rectangular region shown in FIG. 1, all rectangular regions being
identical.