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Johnny Mystery and The Halloween Killer

On Halloween night, a young detective named Johnny Mystery comes across a girl trying to escape from the police. Then, Johnny tries to unravel an intriguing murder case that happened during a party at the Municipal Music School.

Steam Page
Release
June 22, 2020
6 years and 42 days ago
Steam Reviews
Mostly Positive29 reviews75.9%

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Updated: Jul 14, 2026Developer scaleThe operating scale of the game's developer.
Updated: Jul 14, 2026Publisher scaleThe operating scale of the game's publisher.
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Search Google: How is Johnny Mystery and The Halloween Killer and Ma Ma Software funded?FundingThe known source of funding behind the game.
Updated: Jul 14, 2026Creative controlWho appears to retain creative control of the game.
Updated: Jul 14, 2026Release statusWhether and how the game has been released.

Media

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About the Game

On Halloween night, a young detective named Johnny Mystery comes across a girl trying to escape from the police.
Then, Johnny tries to unravel an intriguing murder case that happened during a party at the Municipal Music School.

This is a mystery visual novel with more than 10,000 words, multiple endings and a logic problem to be solved.

Future chapters will be regularly released.