The Parade Problem - Park. Peg and Cat need to sort out recyclables to clean up the park in time for the nursery school's Halloween Parade. Primary Content: Sorting; Secondary Content: Estimating.The Halloween Problem - Peg's Neighborhood. 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 Content: Fair Sharing; Secondary Content: Positional relationships (in front of/behind).