Rubik's Cube
The Rubik's Cube is a three-dimensional combination puzzle invented in 1974 by Hungarian architect and professor Ernő Rubik[^c1]. Originally called the "Magic Cube," it was designed as a teaching tool to help students understand three-dimensional space[^c2]. The puzzle consists of 26 smaller cubes (cubies) arranged in a 3×3×3 grid, with each of the six faces covered in stickers of a distinct color. The objective is to rotate the faces until each face shows a single uniform color.
The cube has 43,252,003,274,489,856,000 possible configurations[^c3], yet any position can be solved in 20 moves or fewer, a result known as God's Number[^c4]. It has sold over 450 million units worldwide, making it one of the best-selling toys of all time[^c5]. The puzzle is considered one of the "three great impossibles" of the puzzle world alongside the Klotski puzzle and Peg Solitaire[^c6].
Since the 1980s, the cube has spawned the global competitive sport of speedcubing. The first world championship was held in Budapest in 1982, and competitive cubing is now governed by the World Cube Association[^c7]. As of 2025, the world record for a single 3×3 solve is 3.08 seconds[^c8]. The cube's mathematical structure, rooted in group theory, has made it a subject of ongoing academic interest, and specialized speedcubes with smoother turning mechanisms have transformed it from a toy into a competitive tool.