1985 saw many sequels and prequels in video games, such as Super Mario Bros. and Kung Fu, along with new titles such as Commando, Duck Hunt, Gauntlet, Ghosts 'n Goblins, Gradius, Hang-On, Space Harrier, Tetris and The Way of the Exploding Fist. The year's highest-grossing arcade video games were Hang-On and Karate Champ in the United States, and Commando in the United Kingdom. The year's best‑selling home system was the Nintendo Entertainment System (Famicom) for the second year in a row, while the year's best‑selling home video game was Super Mario Bros.

Kung-Fu Master, known as Spartan X in Japan, is a side-scrolling beat 'em up developed by Irem as an arcade video game in 1984, and distributed by Data East in North America. Designed by Takashi Nishiyama, the game was based on Hong Kong martial arts films. It is a loose adaptation of the Jackie Chan, Sammo Hung, and Yuen Biao film Wheels on Meals (1984), called Spartan X in Japan, with the protagonist Thomas named after Jackie Chan's character in the film. The game is also heavily inspired by the Bruce Lee film Game of Death (1972), which was the basis for the game's concept. Nishiyama, who had previously designed the side-scrolling shooter Moon Patrol (1982), combined fighting elements with a shoot 'em up gameplay rhythm. Irem and Data East exported the game to the West without the Spartan X license.