The author presents three clinical studies of children who introduced hide-and-seek into their therapy sessions revealing some early and underlying experience of relationship that was causing problems in the present. As the game is characterized by disappearance and appearance, separation and reunion, it likely activates the attachment system and thereby creates an opportunity for reassurance, rehearsal, or re-working. As a structure, it offers the safe holding of a here-I-am-there-you-are matrix, a potentially intersubjective space. The way in which each child plays reveals what is personally at stake. The hide-and-seek game allows for a rich, metaphoric source of diagnostic leads and hypotheses for clinical intervention.