Dragon Quest (Japanese: ドラゴンクエスト Hepburn: Doragon Kuesuto?), published as Dragon Warrior in North America until 2005,[Note 1] is a series of internationally best-selling console role-playing video game (RPG) titles created by Yuji Horii and his studio, Armor Project. The series is published by Square Enix (formerly Enix), with localized versions of later installments for the Nintendo DS (NDS) being published by Nintendo outside of Japan. The first title was published in 1986 and there are currently ten main-series titles and numerous spin-off games. Nearly every game in the main series has either an anime or manga adaptation, or both. The series has had a significant impact on the development of console RPGs, and introduced a number of features to the genre. Installments of the series have appeared on MSX computers, Nintendo Entertainment System, Super Nintendo Entertainment System, Game Boy Color, Game Boy Advance, Nintendo DS, PlayStation, PlayStation 2 and Wii video game consoles, and several models of mobile phones. Each Dragon Quest video game soundtrack is arranged into an orchestral piece and the video game series is the first to have live-action ballet adaptations. Early in the series the Dragon Quest games were released under the title Dragon Warrior in North America to avoid trademark conflict with the pen-and-paper role-playing game DragonQuest. Square Enix did not register the Dragon Quest trademark for use in the United States until 2002. The basic premise of most Dragon Quest titles is to play a hero who is out to save the land from peril at the hands of a powerful evil enemy, with the hero usually accompanied by a group of party members. Common elements persist throughout the series and its spinoff titles: turn-based combat; recurring monsters, including the Slime, which became the series' mascot until the English version of Dragon Quest VIII: Journey of the Cursed King; a text-based menu system;[Note 2] and random encounters (in the main series), until Dragon Quest IX: Sentinels of the Starry Skies. The series is one of the few long-running video game series to have a stable key development team; scenario writer and game designer Yuji Horii, character designer Akira Toriyama and music composer Koichi Sugiyama have handled their respective roles from the beginning of the series. The original concepts, used since the first game, took elements from the western RPGs Wizardry and Ultima. A great deal of care was taken to make the gameplay intuitive so that players could easily start to play the game. The series features a number of religious overtones which were heavily censored in the NES versions. Dragon Quest X is the newest game in the series. It is a massively multiplayer online game, featuring online battles. It has currently been released in Japan on the Wii, Wii U, and Microsoft Windows.

Dragon Scroll (ドラゴンスクロール 甦りし魔竜, lit. "Magic Dragon Scroll Dragon Reborn") is a 1987 video game that was released exclusively in Japan for the Family Computer. The game is non-linear and operates almost like a sandbox game. Many video games helped to influence this video game, including The Legend of Zelda. A large video game world helps to define the complexity of the gameplay. However, most puzzles are impossible for non-Japanese speakers to solve, but a fan-made translation patch has been made available by King Mike Translations in 2008.

Dragon's Lair (ドラゴンズレア Doragonzu Rea?) is based on the laserdisc game of the same name; it is a 1990 platformer released for the Nintendo Entertainment System and developed by the MotiveTime group. Plotwise, the game is identical to the original.

DuckTales (わんぱくダック夢冒険 Wanpaku Dakku Yume Bōken?, lit. "Naughty Ducks Dream Adventures") is an action platformer video game developed by Capcom and based on the Disney animated TV series of the same name. It was first released in North America for the Nintendo Entertainment System in 1989 and was later ported to the Game Boy in 1990. The story involves Scrooge McDuck traveling across the globe collecting treasure and outwitting his rival Flintheart Glomgold to become the world's richest duck. Produced by key personnel from the Mega Man series, DuckTales would go on to sell over a million copies worldwide on each system, becoming Capcom's best-selling title for both platforms. The game was praised for its tight control, unique and non-linear gameplay and bright presentation, and is often regarded as one of the best titles for the NES, appearing on numerous "Best of" lists. DuckTales was followed by a sequel, DuckTales 2, in 1993. A Remastered version of DuckTales developed by WayForward Technologies, featuring high resolution graphics and the original voice cast from the show, was released in 2013 for PC, Xbox 360, PlayStation 3, and Wii U.

DuckTales 2 (ダックテイルズ2, Dakku Teiruzu 2?) is a platform video game developed and published by Capcom and is a sequel to the original DuckTales based on the Disney animated series of the same name. Originally released on the Nintendo Entertainment System in early 1993, the title was later ported to the Game Boy handheld system in Japan and North America at the end of the year. Due to its relatively late console release, the NES version is considered a rarity among retrogaming enthusiasts.