The ornamental design for an accessory for gamecontroller, as shown and described.
FIG. 1 is a perspective view of an accessory for game controller showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a perspective view of the game controller shown in a first configuration of use; and,
FIG. 10 is a perspective view of the game controller shown in a second configuration of use.
The dash-dash broken lines in the drawings depict portions of the accessory for game controller that form no part of the claimed design. The dot-dot-dash broken lines in the drawings depict environmental structures that form no part of the claimed design.