Gateway to the Underworld is a single level exterior map with a west and east side of volcanic rock bisected by a river of fire. The river of fire is spanned by a bridge of stone and brick lined with spikes along its railings. The bridge leads to a path that ends at a hollowed out statue’s belly which has a cave inside that seems to lead inside the volcano or somewhere else.
Gateway to the Underworld is intended for use in fantasy or horror games. It could also be an interesting modern pulp map of an archeological ruin next to a volcano with a slow magma flow.