In the Rover Reveal Ground Challenge Preview, students become ground mobility engineers for the first time as they build and test a simple wheeled rover — previewing the Mars terrain engineering challenges coming in Q2. Set inside Mr. B Engineering Games, this flex-week sprint gives Grade 4 students a low-stakes first encounter with wheel design, terrain navigation, and mobility data collection. What Students Will Do* Build a simple wheeled rover from provided materials within a 10-minute build