From around 1980, a #puzzle advertising Fungus Computer Products of Castleford, West Yorkshire, England. The four cubes must be arranged in a 4x1 cuboid to show a total of ten mushrooms on each long face. The first puzzle of this type, Katzenjammer, was produced around 1900.

A c1920s #puzzle advertising ICI Dyestuffs Group. 9 pieces must be placed in a 5x5 square with no colour repeated in any row or column. One piece is marked ICI, two are marked BDC (British Dyestuffs Corporation) and one is marked OW. Looking for suggestions as to what OW means.

From 1970, The Listener #Crossword Puzzle Book, published by Penguin, together with the second volume of #puzzles published a year later. Among the setters featured is Gong (Jonathan Crowther) who as Azed recently set his 2,750th puzzle in The Observer newspaper.

A Rubik's Cube with a secret - it's actually a working salt grinder from around 2009. Made to the same dimensions as the classic #puzzle, there was also a companion pepper grinder, which came with the red face on top. These were sold as Rubik's Cruet, but are no longer produced.

Modern #Puzzles by Henry Ernest Dudeney, published by C Arthur Pearson. This is the second edition, undated in the front matter, but the dust jacket rear flap contains an advert for the Fourth Times #Crossword Puzzle Book which dates it to around 1936.

From 1976, Leadergrams by Frederick and David Bates. Answers to clues in the left hand grid form an acrostic spelling out an author and one of their works. Transcribing the numbered cells into the right hand grid reveals a quotation from the same work. #puzzles

The Crossword Addict #Puzzle, a 49-piece sliding tile puzzle featuring a #crossword design. Produced by Dodo Designs of Tunbridge Wells, England. Undated but perhaps from around the 1990s.

Weekend #Crossword #Puzzle Book No. 2, published by Associated Newspapers Group PLC, 1982. Over 90 quickies plus 10 real stinkers. Price 70p.

The Fifth Four Square #Crossword #Puzzle Book, by Harold S Tribe and Roderick Morrison. Published by The New English Library, April 1966. 131 standard cryptic puzzles and a handful of specials, including 2 numericals.