Giving options for play in Victorian England, Cthulhu by Gaslight was first published as a boxed set in 1986. It included details of all aspects of life during Victorian times, a map of London, character sheets and a complete period-appropriate adventure, The Yorkshire Horror.
A second edition was released in 1989, this time in book-only format. This release saw the addition of an article on world politics of the era, extra maps and a guide to cockney slang, amongst other things.
In 2012 a third edition was released; this included an extra scenario and more. First released in print, it is currently only available in PDF and ebook formats.