Learn measurement & estimation through hands-on play on math adventure! Real-time targeted teaching tips & nudges let kids learn through experimentation and build confidence in a stress-free environment. Self-paced play means kids have time to master a concept before moving on to new material. (No WiFi necessary for game play). An Osmo Base for iPad or Fire Tablet & an iPad or Fire Tablet are not included, both are required for game play. Osmo games bring a child's creative imagination to life with hand held pieces. Approved by parents and teachers worldwide, used in over 31,000 classrooms.