Ultima IV has a much larger game world than its predecessors, with an overworld map sixteen times the size of Ultima III and puzzle-filled dungeon rooms to explore. It is the first in the 'Age of Enlightenment' trilogy, shifting the series from the hack and slash, dungeon crawl gameplay of its 'Age of Darkness' predecessors towards an ethically-nuanced, story-driven approach. Ultima IV: Quest of the Avatar, first released in 1985 for the Apple II, is the fourth in the series of Ultima role-playing video games.