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WordNet
play therapy

n. form of psychotherapy for children that uses play situations for diagnosis or treatment

Wikipedia
Play therapy

Play therapy is generally employed with children aged 3 through 11 and provides a way for them to express their experiences and feelings through a natural, self-guided, self-healing process. As children’s experiences and knowledge are often communicated through play, it becomes an important vehicle for them to know and accept themselves and others. This approach is common to young children.