The Fungal Sprawl: (DnD game originally). The PCs investigate the history of a fallen human empire and find disturbing signs of meddling by two ancient nonhuman civilizations. Soon they find themselves trapped in a three-way contest between a fungal civilization, a lizardman civilization, and the remnants of humanity. Worse still, a shadowy alien sentience is at work behind the scenes, playing all three sides off against each other. A mature-themed subversion of the Super Mario Brothers story.