Rubik's Revenge

A Rubik's Revenge is a 4x4x4 twisty puzzle, meaning it consists of 56 smaller visible cubes. Unlike the standard 3x3x3 Rubik's Cube, it features 24 center pieces that can move independently. It does not have fixed center pieces, which adds a significant layer of complexity to the solve.

Solving the Rubik's Revenge requires an entirely different approach because the center pieces can move independently and there are no fixed centers. Solvers typically must first pair up the edge pieces and build the center blocks before treating the puzzle like a standard 3x3x3. Additionally, the puzzle can encounter "parity errors," which require special algorithms to fix.

While the original Rubik's Cube was invented by Ernő Rubik, the 4x4x4 version was actually invented by a different Hungarian designer named Péter Sebestény. Sebestény wanted to create a more complex puzzle and introduced the mechanism that allows the independent center pieces to move. It was later licensed and brought to market under the Rubik's brand name.

The world record for solving a 4x4x4 cube changes frequently as speedcubers continue to push the boundaries of the sport. As of the mid-2020s, top competitors regularly solve the Rubik's Revenge in under 20 seconds. These incredibly fast times require memorizing hundreds of complex algorithms and utilizing highly optimized solving methods.