The Parade Problem / The Halloween Problem. The Parade Problem Peg and Cat must sort out recyclables to clean up the park in time for the nursery school's Halloween Parade. Primary Learning Goal: Sorting. Secondary Learning Goal: Estimating. / The Halloween Problem While trick or treating, Peg and Cat find themselves pursued by a metal monster. Later they teach fair sharing to a “friend” who turns out to be a real tiger! Primary Learning Goal: Fair Sharing. Secondary Learning Goal: Positional relationships (in front of/behind).