advantage of Capcom's CPS arcade chipset, with highly detailed characters and stages. Whereas previous games allowed players to combat a variety of computer-controlled fighters, Street Fighter II allowed players to play against each other. The popularity of Street Fighter II surprised the gaming industry, as arcade owners bought more machines to keep up with demand. Street Fighter II was also responsible for popularizing the combo mechanic, which came about when skilled players learned that they could combine several attacks that left no time for the opponent to recover if they timed them correctly. Its success led to fighting games becoming the dominant genre in the arcade game industry of the early 1990s, which led to a resurgence of the arcade game industry. The popularity of Street Fighter II led it to be released for home game consoles and becoming the defining template for fighting games. Timeline SNK released Fatal Fury shortly after Street Fighter II in 1991. It was designed by Takashi Nishiyama, the creator of the original Street Fighter, which it was envisioned as a spiritual successor to. Fatal Fury placed more emphasis on storytelling and the timing of special moves, and added a two-plane system where characters could step into the foreground or background. Meanwhile, Sega experimented with Dark Edge, an early attempt at a 3D fighting game where characters could move in all directions. However, Sega never released the game outside Japan because it felt that "unrestrained" 3D fighting games were unenjoyable. Sega also attempted to introduce holographic 3D technology to the genre with Holosseum in 1992, though it was unsuccessful. Several fighting games achieved commercial success, including SNK's Art of Fighting and Samurai Shodown as well as Sega's Eternal Champions. Nevertheless, Street Fighter II remained the most popular, spawning a Champion Edition that improved game balance and allowed players to use boss characters that were unselectable in the previous version. Chicago's Midway Games achieved unprecedented notoriety when they released Mortal Kombat in 1992. The game featured digital characters drawn from real actors, numerous secrets, and "Fatality" finishing maneuvers in which the player's character kills their opponent. The game earned a reputation for its gratuitous violence, and was adapted for home game consoles. The home version of Mortal Kombat was released on September 13, 1993, a day promoted as "Mortal Monday". The advertising resulted in line-ups to purchase the game and a subsequent backlash from politicians concerned