A Japanese teenager has won the 25th Rubik's Cube World Championships, after finishing the fiendish 1980s puzzle in less than 13 seconds.
The idea is to get all the squares of the same colour on the same side, but it's not as easy as it sounds.
Yu Nakajima, 16, beat hundreds of other people to win the championships in Hungary's capital, Budapest.
Some competitors only used their feet to try to crack the puzzle, while others completed it blind-folded!
But no-one could beat the world record of 9.86 seconds that was set by Thibaut Jacquinot in May.
The puzzle was designed by Hungarian architect Erno Rubik back in 1974, but it wasn't available in any other country until 1980 when it became an instant world-wide hit.
More than 300 million of the cubes, which have millions and millions of possible solutions - have been sold all around the globe.