Play block

The ornamental design for a play block, as shown and described.

FIG. 1 is a perspective view of the “play block” showing my new design;

FIG. 2 is a right side elevation view thereof, the left side elevation view being identical thereto;

FIG. 3 is a front side elevation thereof, the back side elevation view being identical thereto;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

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