Scooby-Doo

Scooby-Doo (full title: Scooby-Doo in the Castle Mystery) is: a platform game, that was developed by Gargoyle Games for Elite Systems, and released for the Sinclair ZX Spectrum, the Amstrad CPC, the Commodore 64, and the Commodore Plus/4 in 1986; it is based on the Hanna-Barbera television series of the same name, which was first aired in 1969 but still gets new incarnations to this day, and the show's original incarnation, Scooby-Doo, Where Are You! (which ran until 1970), was spoofed by 20th Century Fox's science-fiction cartoon Futurama in 2013, as Bendee-Boo and the Mystery Crew.

Story
This is from the back of the cassette's inlay card, the front of which is shown in the image to the right:

The Mystery Machine arrives at a ruined castle, and the gang ''climb out, ready to explore. Suddenly, Velma, Shaggy, Daphne and Fred'' are seized by large hands and a chorus of voices cry out, "Our ''experiments are almost complete. Nothing can stop us now!" Though'' frightened, Scooby decides to looks for his friends, but soon has the ''feeling that he is not alone. Ghosts and demons of the strangest kind'' gather on all sides and appear out of doorways, intent on stopping him ''freeing the rest of the gang. Can you, as Scooby-Doo, fight your way'' through the mad scientists' henchmen to rescue your friends, then seek ''out their captors? Perhaps the trail of Scooby Snax may help you in'' your search. © Hanna-Barbera Productions Inc. 1986