Rubik's family cubes of all sizes Rubik's family cubes of all sizes The original Rubik's cube was a mechanical 3×3×3 cube puzzle invented in 1974 by the Hungarian sculptor and professor of architecture Ernő Rubik. Extensions of the Rubik's cube have been around for a long time and come in both hardware and software forms. The major extension have been the availability of cubes of larger size and the availability of the more complex cubes with marked centres. The properties of Rubik’s family cubes of any size together with some special attention to software cubes is the main focus of this article. Many properties are mathematical
Isolate (puzzle) Isolate (puzzle) Isolate is a logic-based line-placement puzzle. The puzzler is provided with a grid containing walls, dots and a set of area sizes. A solved grid will contain areas of the given sizes containing two dots each. The puzzle was invented by an English puzzle enthusiast, Laurence May, in 2007. It is produced by Vexus Puzzle Design and appears daily along with Sudoku and Kakuro in the Daily Mail. The Isolate grid must be partitioned into areas so that each area contains two dotted squares. Area sizes must match those shown below the grid and each + sign must