The ornamental design for a climbableplaygroundstructure, as shown and described.
FIG. 1 is a perspective view of a climbable playground structure comprised of six closed-loop tubes that is in keeping with the invention;
FIG. 2 is a plan view of the climbable playground structure of FIG. 1;
FIG. 3 is a front elevational view of the climbable playground structure of FIG. 1;
FIG. 4 is a perspective view of a pyramid comprised of four climbable playground structures (each as shown in FIG. 1), wherein adjacent structures have a common closed-loop tube;
FIG. 5 is a plan view of the pyramid depicted in FIG. 4;
FIG. 6 is a front elevational view of the pyramid depicted in FIG. 4 and FIG. 5;
FIG. 7 is a perspective view of another pyramid comprised of four climbable playground structures (each as shown in FIG. 1), wherein adjacent structures do not have a common closed-loop tube;
FIG. 8 is a plan view of the pyramid depicted in FIG. 7; and,
FIG. 9 is a front elevational view of the pyramid depicted in FIG. 7 and FIG. 8.