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Kirby's Biggest Case (Kirbys Grösster Fall) is a 32-page, one-shot comic book story published in Germany in a 1996 issue of the magazine Club Nintendo. The comic was written by Claude M. Moyse, and drawn by Work House Co. Ltd. It is the second of two German-language Kirby comic stories that were created for the magazine, the first being Kirby and the Mystery of the Glibbers in 1993. Unlike the earlier story, it was completed in a single issue of Club Nintendo, rather than being split across multiple issues.
Club Nintendo was the German counterpart of Nintendo Power in the United States, and is not to be confused with the separate Club Nintendo magazine published in Mexico and Latin America, or Nintendo's defunct international customer rewards service, which was also called Club Nintendo. Although the comic was drawn by uncredited Japanese artists employed by Work House Co. Ltd. in Tokyo, it was written by Claude M. Moyse in Germany, who chose to take very heavy liberties with the Kirby series' source material.
Certain pages of the comic serve as advertisements for Kirby's Dream Course, Kirby's Ghost Trap (the European title of Kirby's Avalanche), and Kirby's Block Ball. Screenshots of each game are used on their respective pages, along with a brief sales pitch. Rick, Coo, Kine, Mr. Shine, Sword Knight, Lololo, and Lalala also make appearances. This is a significant departure from Kirby and the Mystery of the Glibbers, which did not make reference to any specific Kirby games, nor contain any screenshots.
According to a German-language online interview with the writer, Moyse disliked Masahiro Sakurai for unspecified reasons, and deliberately sought to spite him through the comic by "turning Kirby into a freak." However, due to the joking nature of the interview, it is unknown whether Moyse was being entirely serious in making these statements. 
A parody of the noir fiction and sci-fi genres, the story depicts Kirby as a private detective in a real-world setting outside of Dream Land, populated by both humans and Kirby series characters. King Dedede takes the role of Kirby's assistant. WhileKirby and the Mystery of the Glibbers had also cast Kirby as a detective, Moyse's characterization of him is decidedly more hard-edged and satirical. Kirby wears clothes and sunglasses through part of the comic, and is even shown smoking a cigarette in one panel, with a bottle of hard liquor and a shot glass on his desk. He also speaks an English swear word while painfully falling down a cliff, in likely the only instance of vulgar language ever being used in official Nintendo media featuring Kirby. There are suggestive depictions of human female characters, gruesome human corpses, and raunchy humor, such as when Kirby accidentally barges into a women's bathroom. The overall tone is drastically out of character with any other official portrayal of Kirby.
The light-hearted mystery story centers around the supposed disappearance of Dr. Mainhold, a comic-original human character who creates a machine that allows video game characters to travel into the real world and back. This machine looks almost identical to a gigantic Nintendo 64, and its existence provides an explanation for the Kirby series characters' appearance in this more realistic setting. Another large device, modeled after a Game Boy, is used by the villain to turn King Dedede evil and make him fight Kirby inside of the game Kirby's Block Ball. Among various other comic-original characters is Susy, a female pink puffball wearing a bow and high heels, who closely resembles Kirby and is implied to be his wife. After the mystery is solved by revealing that Dr. Mainhold had been the villain all along, the story concludes with a direct appeal from Kirby, who advises the reader to buy his "Kirbycool" games.