What kind of trolley will you build this time? Use the 7 magnetic play blocks to build your own cool creations, or try to recreate the trolley as shown on one of the 24 tasks. The trolley itself has 2 different sides that can each be used as a base to start building on. Combine Build & Drive with all the other SmartMax sets and practice fine motor skills, balance and imagination! Hours of play and building fun guaranteed!