FIG. 1 is a top plan view of a conversion adapter for game machine, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top, front and right side perspective view thereof;

FIG. 8 is a bottom, left and rear side perspective view thereof; and,

FIG. 9 is a reference perspective view of a conversion adapter for game machine in use.

The broken line showing of the environment is for illustrative purposes only and forms no part of the claimed design.