We claim the ornamental design for a game display screen or portion thereof with icon, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
The sole FIGURE is a front view of a portion of a display screen with an icon for showing our new design.
The outermost perimeter of broken lines depicts the game display screen, or portion thereof, and forms no part of the claimed design.