Sentence:  It was all set up so there would be no dust anywhere and so that their children would color in the coloring room , paint in the painting room , <WSD>play</WSD> with blocks in the block house , and do all the other things in the proper rooms at exactly the right time . 
Meaning of the word marked with <WSD> tags:  be at play; be engaged in playful activity; amuse oneself in a way characteristic of children