LEGO Ideas Sonic the Hedgehog – Green Hill Zone 21331. Build the Green Hill Zone level with Dr. Eggman, a spring, Sonic minifigure, Moto Bug and Crabmeat figures. Chaos Emeralds are collected as the build progresses and a stand holds all 7 emeralds and Sonic. The model measures approximately 17 cm high, 36 cm wide and 6 cm deep and can be rearranged or connected to additional sets.