Just when you thought you had the school computer to yourself an underling of the headmaster calls you to his office. He accuses you of programming the computer system to randomly print smutty language on the terminals while the first years were having an Information Technology lesson. Although you are innocent your protestations fall on deaf ears. You are sentenced to a three-hour detention for the next three nights.
As you have been a model pupil you have never stayed after school before - had you any inkling of what really went on at the school you would never have stayed until the end of the day. After dark your school undergoes a horrible transformation. Familiar objects turn nasty. Death stalks the school corridor. Will you escape with your life?
Published in the "Virgin Computer Series" book Adventures for your BBC Micro by Alex Gollner as "Night School".
Included in the Adventures for your ZX Spectrum book by Clive Gifford; which was also translated and re-released in Serbia and the Netherlands.
Featured in the corresponding Adventures for your Commodore 64 book by Duncan Quirie (David Estall?); published in both English and Dutch.
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This game is not written by David Estall but by Adam Waring. It says so in the the English and Ducht Version of "Adventures for your Commodore 64" written by David Estall.
That matches the message printed in the Yugoslavian edition (!) of Clive Gifford's book... although there he's credited as "Adam Vering"... so I'll alter the author in line with your suggestion.