Some might find the Rubik's cube a serious mental test, but others think it's a little easier to solve.
A 14-year-old boy has broken a world record by completing the puzzle in less than five seconds.
Lucas Etter was taking part in the River Hill Fall competition in Maryland when he solved the challenge in just 4.9 seconds, - that's 0.35 seconds quicker than the previous record.
Video footage of Etter's win shows him inspecting the cube prior to his attempt, before picking it up and whizzing the cubes round with his fingers to complete it.
As soon as he put it on the table and saw the timer, Etter jumped up and screamed in celebration knowing he'd beaten the current record.
The Rubik's speedcubing website states entrants get 15 seconds to inspect the cube before they attempt to solve it.
The attempt is timed by a StackMat timer, which is activated when the person lifts their hands off the touchpad, then down again once the cube is completed.
Etter has taken the top spot from 15-year-old Collins Burns, who completed the Rubik's cube in 5.25 seconds in April 2015.
The World Cube Association has seen the record times drop dramatically over the past few years. The first record was set at 22.95 seconds by 16-year-old Minh Thai in 1982.