The ornamental design for a gamemachine, as shown and described.
FIG. 1 is a first perspective view of a game machine;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a top view thereof.
The portion shown by broken lines is for illustrative purpose only and forms no part of the claimed design. The broken lines, which define the boundary of the claim, form no part of the claimed design.