Who can solve the Rubik’s Cube Master 4 x 4 puzzle? One of the world's number one brain-teasing puzzlers is still going strong. This 4 x 4 Master Puzzle has tons of puzzling combinations! And of course, only 1 solution. Are you up for the challenge? This classic and super-addictive twisty puzzle puts players' skills to the test to see if they can twist, turn, and rotate to match up the colors on all sides. This Rubik's Master 4 x 4 puzzle has no fixed pieces in the center, so it's harder to solve than the 3 x 3 Rubik's Cube. The Rubik's Cube puzzle makes a great birthday or holiday gift for boys and girls, ages 8 and up.