German to English Social Sciences Other

Sentence: "In diesem Kapitel geht es um Steckübungen"

This is from a book about play activities for babies and toddlers. I'm looking for an all-embracing term to cover the "Steck-" part of the word above. The chapter deals with shape sorting activities, making things with building blocks, threading beads onto strings etc etc. Basically all the activities that involve a child taking something into their hands and "putting" it somewhere else.

I have a feeling there may be a really obvious answer, but for some reason, it just won't come to me....