Question: What was the last year of the Castle of Riddles publisher?

Knowledge 1: Castle of Riddles
Castle of Riddles is a text adventure released by Acornsoft for the BBC Micro (in 1982) and Acorn Electron (1984) home computers. The game was written by Peter Killworth and was one of a series of text adventures written for, or ported to the BBC Micro by the same author (others including "Countdown to Doom" and "Philosopher's Quest"). As with all such games, only text is used. The player must use a simple 'verb-noun' format (e.g. 'Go North', 'Get lamp') to control the game. Unlike Killworth's other Acornsoft adventures, "Castle of Riddles" was not updated and reissued by Topologika so became unavailable after 1985 when Acorn Computers (parent company of Acornsoft) pulled out of the games publishing market. Some of the puzzles however were included in the Topologika version of "Philosopher's Quest". [SEP] Knowledge 2: Acornsoft
Acornsoft ceased to operate as a separate company upon the departure of David Johnson-Davies in January 1986. Past this date, Acorn Computers used the Acornsoft name on office software it released in the "VIEW" family for the BBC Master series. In 1986 Superior Software was granted a licence to publish some Acornsoft games and rereleased many, individually and as compilations such as the "Play It Again Sam" and "Acornsoft Hits" series. By agreement, the Acornsoft name was also used on the packaging of some of the subsequent Superior games. Superior chose not to take on Acornsoft's text adventure games, most of which were released in updated versions by Topologika along with some sequels from the same authors.
Knowledge 1: Castle of Riddles
Castle of Riddles is a text adventure released by Acornsoft for the BBC Micro (in 1982) and Acorn Electron (1984) home computers. The game was written by Peter Killworth and was one of a series of text adventures written for, or ported to the BBC Micro by the same author (others including "Countdown to Doom" and "Philosopher's Quest"). As with all such games, only text is used. The player must use a simple 'verb-noun' format (e.g. 'Go North', 'Get lamp') to control the game. Unlike Killworth's other Acornsoft adventures, "Castle of Riddles" was not updated and reissued by Topologika so became unavailable after 1985 when Acorn Computers (parent company of Acornsoft) pulled out of the games publishing market. Some of the puzzles however were included in the Topologika version of "Philosopher's Quest". [SEP] Knowledge 2: Christian Coulson
Christian Peter Coulson (born 3 October 1978) is an English actor best known for playing the 16 - year old Tom Marvolo Riddle in Harry Potter and the Chamber of Secrets.
Knowledge 1: Castle of Riddles
Castle of Riddles is a text adventure released by Acornsoft for the BBC Micro (in 1982) and Acorn Electron (1984) home computers. The game was written by Peter Killworth and was one of a series of text adventures written for, or ported to the BBC Micro by the same author (others including "Countdown to Doom" and "Philosopher's Quest"). As with all such games, only text is used. The player must use a simple 'verb-noun' format (e.g. 'Go North', 'Get lamp') to control the game. Unlike Killworth's other Acornsoft adventures, "Castle of Riddles" was not updated and reissued by Topologika so became unavailable after 1985 when Acorn Computers (parent company of Acornsoft) pulled out of the games publishing market. Some of the puzzles however were included in the Topologika version of "Philosopher's Quest". [SEP] Knowledge 2: Buckingham Palace
The palace, like Windsor Castle, is owned by the Crown Estate. It is not the monarch's personal property, unlike Sandringham House and Balmoral Castle. Many of the contents from Buckingham Palace, Windsor Castle, Kensington Palace, and St James's Palace are part of the Royal Collection, held in trust by the Sovereign; they can, on occasion, be viewed by the public at the Queen's Gallery, near the Royal Mews. Unlike the palace and the castle, the purpose-built gallery is open continually and displays a changing selection of items from the collection. It occupies the site of the chapel destroyed by an air raid in World War II. The palace's state rooms have been open to the public during August and September and on selected dates throughout the year since 1993. The money raised in entry fees was originally put towards the rebuilding of Windsor Castle after the 1992 fire devastated many of its state rooms. 476,000 people visited the palace in the 2014–15 financial year.

Answer: 1986