Abstract: A modular/convertible toddler climb unit is disclosed. This unit can be used independently in a variety of different ways as well as combined with other units to form a dynamic and physical skill development structure for children. The unit includes a base with adjacent steps and a slide formed on an upper sloping surface. Upper fixed side fences are provided on opposite sides of the adjacent steps and slide with upstanding mountable side fences cooperating with at least one of the upstanding fixed side fences in order to serve as boundary around at least part of an upper generally horizontally directed upper surface of the base. The mountable side fences can be positioned on the base in a number of different ways as well as the generally horizontally directed upper surface of two adjacent bases for cooperative interaction between such adjacent bases. Other play units can be associated with the toddler climb and slide unit to provide various play experiences for children.