The ornamental design for a portablehandheldgamingunit, as shown and described.
FIG. 1 is a perspective view of a portable handheld gaming unit showing our new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a left side elevation thereof;
FIG. 5 is a right side elevation thereof;
FIG. 6 is a front elevation thereof;
FIG. 7 is a rear elevation thereof;
FIG. 8 is a top perspective view thereof, with the arm shown in an extended position;
FIG. 9 is a bottom perspective view thereof, with the arm shown in an extended position; and,
FIG. 10 is a perspective view thereof, shown with a stacked another portable handheld gaming unit, shown in broken lines.
The broken lines environment in FIGS. 1, 6, 8, and 10 forms no part of the claimed design. The stacked unit, shown in broken lines, in FIG. 10 forms no part of the claimed design.