The ornamental design for a puzzle with twelve pieces, as shown and described.
This application 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.
FIGS. 1-12 are top plan views showing each of the twelve components of my new design for a puzzle with twelve pieces, each piece being shown in a flattened configuration; and,
FIG. 13 is a bottom view of each of the puzzle pieces shown in FIGS. 1-12.