The ornamental design for a boardgame, as shown and described.
FIG. 1 is a top plan view of a board game in accordance with my design;
FIG. 2 is a side elevational view of my design as viewed from the right
side of FIG. 1, with the left side elevation view being substantially
identical; and,
FIG. 3 is a front elevation view of my design, as viewed from the lower
portion of FIG. 1, and with the rear elevation view thereof being
substantially identical.