The ornamental design for a gamecase, as shown and described.
FIG. 1 is a perspective view of a game case showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a side elevation view, the opposite side being a mirror image thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The labels shown in broken lines on the game case illustrate features of the article to which the design is applied that form no part of the claim. The game cards and dice shown in broken lines in FIG. 1 illustrate the environment in which the game case is used and form no part of the claim.