Espana 1982A 3x3x3 made for the Soccer World Cup 1982 in Spain. It has no stickers.
Espera MasterSpanish version of the Diamond Style Puzzler. Came in several different colour variants.
Fisher CubeTaking the concept of the Rubik's cube and turning it 45 degrees.
Four by four - AnimalsAlternative versions of Tsukuda square with a several animals instead of coloured or numbered pieces.
Genius TowerA cylindrical 3x6 Whip-It puzzle has embossed stars on the pieces.
GruppeteorieRubiks Terning Som Et Skoleeksempel Pa En Gruppe
Handbook Of Cubik MathBy all odds the best book yet written, or likely to be written, on the wonders and the dark unsolved mysteries of the cube - Martin Gardner