to 3D-based genres, popular, long-running series such as Contra and Metal Slug continued to receive new sequels. Rail shooters have rarely been released in the new millennium, with only Rez and Panzer Dragoon Orta achieving cult recognition. 1992 saw the release of Dragon Quest V, a game that has been praised for its involving, emotional family-themed narrative divided by different periods of time, something that has appeared in very few video games before or since. It has also been credited as the first known video game to feature a playable pregnancy, a concept that has since appeared in later games such as Story of Seasons. Dragon Quest V's monster-collecting mechanic, where monsters can be defeated, captured, added to the party, and gain their own experience levels, also influenced many later franchises such as Pokémon, Digimon and Dokapon. In turn, the concept of collecting everything in a game, in the form of achievements or similar rewards, has since become a common trend in video games. Shin Megami Tensei, released in 1992 for the SNES, introduced an early moral alignment system that influences the direction and outcome of the storyline, leading to different possible paths and multiple endings. This has since become a hallmark of the Megami Tensei series. Another non-linear RPG released that year was Romancing Saga, an open-world RPG by Square that offered many choices and allowed players to complete quests in any order, with the decision of whether or not to participate in any particular quest affecting the outcome of the storyline. The game also allowed players to choose from eight different characters, each with their own stories that start in different places and offer different outcomes. Data East's Heracles no Eikō III, written by Kazushige Nojima, introduced the plot element of a nameless immortal suffering from amnesia, and Nojima would later revisit the amnesia theme in Final Fantasy VII and Glory of Heracles. The TurboGrafx-CD port of Dragon Knight II released that year was also notable for introducing erotic adult content to consoles, though such content had often appeared in Japanese computer RPGs since the early 1980s. That same year, Game Arts began the Lunar series on the Sega CD with Lunar: The Silver Star, one of the first successful CD-ROM RPGs, featuring both voice and text, and considered one of the best RPGs in its time. The game was praised for its soundtrack, emotionally engaging storyline, and