The document describes climate modeling experiments of Neoproterozoic conditions using an Earth system model. It explores scenarios ranging from a full "Snowball Earth" to a less severe "Slushball Earth" hypothesis. The model results support a Slushball scenario, with moderately cold global temperatures, ice-free ocean areas near the equator, and a functioning hydrological cycle. A Snowball scenario occurred only under extreme conditions. Higher atmospheric CO2 levels would be required to escape a full glaciation and avoid a "freeze-fry" super-greenhouse situation. Future studies should better model ocean currents and refine paleogeography and CO2 levels needed to melt a Snowball Earth.