In 1987, Zelda II: The Adventure of Link implemented a more traditional RPG-esque system, including experience points and levels with action game elements. Unlike its predecessor, Zelda II more closely fits the definition of an action RPG. Another Metroidvania-style action RPG released that year was System Sacom's Sharp X1 computer game Euphory, which was possibly the only Metroidvania-style multiplayer action RPG produced, allowing two-player cooperative gameplay. The fifth Dragon Slayer title, Sorcerian, was also released that year. It was a party-based action RPG, with the player controlling a party of four characters at the same time in a side-scrolling view. The game also featured character creation, highly customizable characters, class-based puzzles, and a new scenario system, allowing players to choose from 15 scenarios, or quests, to play through in the order of their choice. It was also an episodic video game, with expansion disks later released offering more scenarios. Falcom also released the first installment of its Ys series in 1987. While not very popular in the West, the long-running Ys series has performed strongly in the Japanese market, with many sequels, remakes and ports in the decades that followed its release. Besides Falcom's own Dragon Slayer series, Ys was also influenced by Hydlide, from which it borrowed certain mechanics such as health-regeneration. The Faery Tale Adventure offered one of the largest worlds at the time, with over 17,000 computer screens without loading times. In 1988, Telenet Japan's Exile series debuted, and was controversial due to its plot, which revolves around a time-traveling Crusades-era Syrian assassin who assassinates various religious/historical figures as well as 20th-century political leaders, The gameplay of Exile included both overhead exploration and side-scrolling combat, and featured a heart monitor to represent the player's Attack Power and Armor Class statistics. Another controversial aspect of the game involved taking drugs (instead of potions) that increase/decrease attributes, but with side effects such as heart-rate increase/decrease or death. Origin Systems, the developer of the Ultima series, also released an action RPG in 1988, titled Times of Lore, which was inspired by various NES titles, particularly The Legend of Zelda. Times of Lore inspired several later titles by Origin Systems, such as the 1990 games Bad Blood (another action RPG based on the same engine) and Ultima VI: The False Prophet, based on the same interface. Also in 1989, the enhanced remake Ys I & II was one of the first