Ultima IV: Quest of the Avatar
From Sega Retro
Ultima IV: Quest of the Avatar, known as Última IV in Brazil, is an entry in the Ultima series of RPGs created by Richard Garriot at Origin Systems. It was originally released in 1985 for the Apple II computer, before being brought to the Sega Master System five years later in 1990 (the only Ultima game to be released on a Sega platform). Ultima IV is the first in the "Age of Enlightenment" trilogy, and though references Ultima III: Exodus and prior games, knowledge of previous adventures is not strictly necessary to understand Ultima IV.
Ultima IV is unusual as unlike other games in the series, there is not a defined end boss, or overarching villian in which the player needs to defeat. Instead, the player goes on a spiritual quest as "The Avatar" under instructions of Lord British (a.k.a. Garriot) to promote his eight virtues; honesty, compassion, valor, justice, sacrifice, honor, spirituality and humility, becoming a better person in the process and inspring the people of Britannia.
The Master System version is very much like the Apple II original, however features updated graphics, music and gives its dungeons are played from top-down perspective (as opposed to the pseudo-3D first person view seen in the original). The NES version, released a year prior, makes more significant changes in terms of art design to appease a Japanese audience - the Master System version is hence seen as the more accurate of the two.
Despite the game being created by an American company, the Master System version of Ultima IV was only released in Europe and Brazil. The direct sequel, Ultima V: Warriors of Destiny was released in 1988 and skipped Sega platforms, however at one stage the spin-off Ultima Underworld (which takes place after Ultima VI: The False Prophet) was set to arrive on the Sega Mega CD.