The ornamental design for chest-mounted video game, as shown and described.
FIG. 1 is a front elevational view of my chest-mounted video game;
FIG. 2 is a left side elevational view thereof, with the right side thereof
being the mirror image of the left side elevational view;
FIG. 3 is a top plan view thereof; and,
FIG. 4 is a bottom plan view thereof.
The portions of the design not shown in the drawing are disclaimed. The
broken line showing of a human figure is for illustrative purpose only and
forms no part of the claimed design.