This paper reports an exploratory investigation of motor patterns characteristic of maternal gameplaying behavior conducted with forty-eight 4-, 6- and 8-month-old infants and their mothers. Videotapes of 6-minute laboratory mother-infant play sessions were segmented into maternal games which were categorized according to the type and complexity of stimulation that the mother's motor patterns provided the infant. Categories and brief descriptions of the games are presented in tabular form. Measures of maternal game behavior reflecting low complexity level decreased with an increase in the age of the infant, while measures of maternal game behavior reflecting high complexity level increased. Results suggest that the sensorimotor level of the infant exerts an influence upon maternal motor activity during gameplaying, and that mother-infant gameplaying is a dynamic interactive process which enables the infant to acquire and refine motor skills. (Author/MS)