Display screen or portion thereof with a transitional gaming machine interface

The present application is also related to U.S. patent application Ser. No. 16/557,178, now U.S. Pat. No. 10,867,483, filed Aug. 30, 2019, entitled “Systems and Methods for Providing a Feature Game,” the disclosure of which is hereby incorporated by reference in its entirety.

FIG. 1 is a front view of a display screen or portion thereof with a transitional gaming machine interface showing a first image in a sequence according to our new design;

FIG. 2 is a front view thereof showing a second image in the sequence; and,

FIG. 3 is a front view thereof showing a third image in the sequence.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 through 3 . The process or period in which one image transitions to another image forms no part of the claimed design. The rectangular broken-line perimeter illustrates a display screen or portion thereof and forms no part of the claimed design. The horizontal jagged broken lines indicate a symbolic break in the display screen or portion thereof, and form no part of the claimed design. The appearance of any portion of the article between the break lines forms no part of the claimed design. The remaining broken lines represent elements of the transitional gaming machine interface that form no part of the claimed design.