sequels. The Tower of Druaga, Dragon Slayer and Hydlide were influential in Japan, where they laid the foundations for the action RPG genre, influencing titles such as Ys and The Legend of Zelda. The action role-playing game Hydlide (1984) was an early open world game, rewarding exploration in an open world environment. Hydlide influenced The Legend of Zelda (1986), an influential open world game. Zelda had an expansive, coherent open world design, inspiring many games to adopt a similar open world design. Bokosuka Wars (1983) is considered an early prototype real-time strategy game. TechnoSoft's Herzog (1988) is regarded as a precursor to the real-time strategy genre, being the predecessor to Herzog Zwei and somewhat similar in nature. Herzog Zwei, released for the Sega Mega Drive/Genesis home console in 1989, is the earliest example of a game with a feature set that falls under the contemporary definition of modern real-time strategy. Data East's Karate Champ from 1984 is credited with establishing and popularizing the one-on-one fighting game genre, and went on to influence Konami's Yie Ar Kung-Fu from 1985. Capcom's Street Fighter (1987) introduced the use of special moves that could only be discovered by experimenting with the game controls. Street Fighter II (1991) established the conventions of the fighting game genre and allowed players to play against each other. In 1985, Sega AM2's Hang-On, designed by Yu Suzuki and running on the Sega Space Harrier hardware, was the first of Sega's "Super Scaler" arcade system boards that allowed pseudo-3D sprite-scaling at high frame rates. The pseudo-3D sprite/tile scaling was handled in a similar manner to textures in later texture-mapped polygonal 3D games of the 1990s. Designed by Sega AM2's Yu Suzuki, he stated that his "designs were always 3D from the beginning. All the calculations in the system were 3D, even from Hang-On. I calculated the position, scale, and zoom rate in 3D and converted it backwards to 2D. So I was always thinking in 3D." It was controlled using a video game arcade cabinet resembling a motorbike, which the player moves with their body. This began the "Taikan" trend, the use of motion-controlled hydraulic arcade cabinets in many arcade games of the late 1980s, two decades before motion controls became popular on video game consoles. Sega's Space Harrier, a rail shooter released in 1985, broke new ground graphically and its wide variety of settings across multiple levels gave players