Completely free to play – No ads, no in app purchases**. Serum is a text-based interactive science fiction novel, set in L.B.Speller’s Human Jurisdiction Universe. Requiring no knowledge of of the novels, Serum is a great introduction to the Human Jurisdiction for new readers, or a fascinating expansion for existing fans. Over 75,000 words in length, with 47 possible endings, there are many different stories to tell – some only a couple of choices in length, others far longer. Simply read the text given and select how to proceed from the options provided. Please note, this game is only available in English, and contains descriptions of violence and mature themes unsuitable for younger readers. ** In response to several user requests there is a "buy me a coffee" button. Although this is an in app purchase, it is an entirely voluntary donation and has no impact on the game whatsoever. This game remains completely free to play, contains no adverts, and no in app purchase beyond the option to donate to the author. Discover more of L.B.Speller’s Science Fiction and Horror at https:/sites.google.com/view/lbspeller