Question: What type of video game is the one for which the man known as Radiation is best known?  

Context articles: Manos: The Hands of Fate (video game)
List of Square Enix mobile games
Proto Man
List of Square Enix video game franchises
List of Square Enix video games
Undertale
The Witcher 3: Wild Hunt – Hearts of Stone
Toby Fox
S.T.A.L.K.E.R.: Shadow of Chernobyl
Yu Kanda

Manos: The Hands of Fate is a video game developed and published by FreakZone Games, based on the cult film .
 Although published in 2012, the game features graphics and sound inspired by games found in the 8-bit era for the Nintendo Entertainment System.
 Originally released for iOS systems, "Manos" was later ported to Microsoft Windows and Android.
 "Manos: The Hands of Fate" features Mike, a husband and father who attempts to expunge a man known as "The Master" in order to escape a lodge and rescue his family.
Square Enix is a Japanese video game development and publishing company formed from the merger on April 1, 2003 of video game developer Square and publisher Enix.
 The company is best known for its role-playing video game franchises, which include the "Final Fantasy" series, the "Dragon Quest" series, and the action-RPG "Kingdom Hearts" series.
 Of its properties, the "Final Fantasy" franchise is the best-selling, with a total worldwide sales of over 100 million units.
 The "Dragon Quest" series has shipped over 57 million units worldwide and is one of the most popular video game series in Japan, while the "Kingdom Hearts" series has shipped over 12 million copies worldwide.
 Since its inception, the company has developed or published hundreds of titles in various video game franchises on numerous gaming systems.
Proto Man, known in Japan as Blues (Japanese: ブルース , Hepburn: Burūsu ) , is a fictional character from Capcom's "Mega Man" video game series.
 Proto Man first appeared in the 1990 video game "Mega Man 3", and was known as Break Man (though Proto Man's in-game appearance differs slightly from Break Man's).
 At the end of "Mega Man 3", Dr. Light reveals that Break Man's actual name is Proto Man, and that he is Mega Man's older brother.
Square Enix is a Japanese video game development and publishing company formed from the merger of video game developer Square and publisher Enix on April 1, 2003.
 The company is best known for its role-playing video game franchises, which include the "Final Fantasy" series, the "Dragon Quest" series, and the action role-playing "Kingdom Hearts" series.
 Since its inception, the company has developed or published hundreds of titles in various video game franchises on numerous gaming systems.
 Of its properties, the "Final Fantasy" franchise is the best-selling, with a total worldwide sales of over 110 million units.
 The "Dragon Quest" series has shipped over 66 million units worldwide and is one of the most popular video game series in Japan, while the "Kingdom Hearts" series has shipped over 22 million copies worldwide.
Square Enix is a Japanese video game development and publishing company formed from the merger on April 1, 2003 of video game developer Square and publisher Enix.
 The company is best known for its role-playing video game franchises, which include the "Final Fantasy", "Dragon Quest", and "Kingdom Hearts" series.
 Of its properties, the "Final Fantasy" franchise is the best-selling, with a total worldwide sales of over 100 million units.
 The "Dragon Quest" series has shipped over 57 million units worldwide and is one of the most popular video game series in Japan, while the "Kingdom Hearts" series has shipped over 12 million copies worldwide.
 Since its inception, the company has developed or published hundreds of titles in various video game franchises on numerous gaming systems.
Undertale is a role-playing video game created by American indie developer and composer Toby Fox.
 In the game, players control a human child who has fallen into the Underground, a large, secluded region underneath the surface of the Earth, separated by a magic barrier.
 The player meets various monsters during a quest to return to the surface, mainly through the combat system; the player navigates through mini-bullet hell attacks by the opponent, and can opt to pacify or subdue monsters in order to spare them instead of murdering them.
 These choices affect the game, with the dialogue, characters, and story changing based on outcomes.
The Witcher 3: Wild Hunt – Hearts of Stone is the first expansion pack for the 2015 video game "".
 Developed by CD Projekt RED, "Hearts of Stone" was released for Microsoft Windows, PlayStation 4, and Xbox One on 13 October 2015.
 The expansion follows Geralt of Rivia coming in contact with a mysterious man known as Gaunter O'Dimm, and his connections to Olgierd von Everec, a cursed nobleman.
Toby Fox (born October 11, 1991), also known as Radiation, is an American video game developer and composer.
 He is best known for developing the critically acclaimed video game "Undertale" in 2015.
 He also composed various pieces of music for the webcomic "Homestuck".
S.T.A.L.K.E.R.: Shadow of Chernobyl is a first-person shooter survival horror video game developed by GSC Game World and published by THQ.
 The game is set in an alternative reality, where a second nuclear disaster occurs at the Chernobyl Nuclear Power Plant Exclusion Zone in the near future and causes strange changes in the area around it.
 The game has a non-linear storyline and features gameplay elements such as trading and two-way communication with NPCs.
 The game includes role-playing and first person shooter elements.
 In "S.T.A.L.K.E.R", the player assumes the identity of an amnesiac "Stalker", an illegal explorer/artifact scavenger in "The Zone", dubbed "The Marked One".
 "The Zone" is the location of an alternate reality version of the Zone of alienation surrounding the Chernobyl Power Plant after a second fictitious meltdown, which further contaminated the surrounding area with radiation, and caused strange otherworldly changes in local fauna, flora, and the laws of physics.
 "Stalker" in the context of the video game refers to the older meaning of the word as a tracker and hunter of game or guide.
Yu Kanda (Japanese: 神田ユウ , Hepburn: Kanda Yū ) is a character from "D.Gray-man", a manga series created by Japanese artist and writer Katsura Hoshino.
 Kanda is a young adult who is an exorcist from an organization known as the Black Order.
 Like the other exorcists in the order, he is in charge of destroying demonic enemies known as Akuma, created by a man known as the Millennium Earl.
 For this, he uses an object referred to as "Innocence" sealed within a Japanese sword.
 Kanda sides with the Black Order in their fight against the Earl's group, the Noah Family.
 Kanda is often cold and antisocial toward his allies, even disliking it when people refer to him by his given name, Yu.
 He often engages in fights with his frequent ally, the series' protagonist Allen Walker.
 As the series proceeds, it is revealed he is the result of an experiment from the Black Order that created his artificial body and merged it with the brain of a deceased exorcist.
 Outside the main series and the two anime adaptations, Kanda has also appeared in the "D.Gray-man" light novels, the two video games of the series, and the crossover game "Jump Ultimate Stars".