Grendel's Cave is a real-time browser-based role-playing video game and MUD from Grendel Enterprises. The basis for Grendel’s Cave was Anglo-Saxon mythology and Beowulf, and it is set in the historical medieval period. Scholars consider it an artistic depiction of Grendel and the poem, Beowulf, as well as a modern adaptation and a derivative work of the epic. Educational websites use Grendel's Cave as an Internet learning aid for medieval literature and they considered it an online Beowulf resource.