The term 'Rubik's Brainteaser' refers to a 3-D mechanical puzzle invented in 1974 by Hungarian sculptor and professor of architecture Ernő Rubik. The most well-known version of the puzzle is the Rubik's CUBE, which consists of six faces with nine colored squares on each face. The goal of the puzzle is to rotate the faces of the CUBE so that each face has one solid color. The four-letter solution to this puzzle is 'CUBE'.