The term 'Rubik's Teaser' refers to the popular 3-D puzzle game invented by Hungarian sculptor and professor of architecture Ernő Rubik in 1974. The game consists of a CUBE with six faces, each of which is covered by nine colored squares. The objective of the game is to rotate the faces of the CUBE so that each face has one solid color. The crossword solution for this term is 'CUBE', which accurately describes the physical object used in the game.