Brainstring Advaced - 3D Brain Teaser Puzzle

Back in 1992 inventor Guido Lap came up with the idea of interchangeable strings. Ten years later Brainstring Original was introduced and almost immediately became a worldwide bestseller. To date, Brainstring Original is played in over 40 countries and people are still amazed by its seeming simplicity and surprised by its infinite possibilities. Most recently, after a couple of years in development, there's a new, even more inspiring puzzle: Brainstring Advanced.
Brainstring is a patented brilliant puzzle game for people between 7 and 70. Brainstring comprises a transparant polycarbonate cube with 12 elastic strings. Using an ingenius pattern of incisions the strings can be moved through the cube. The result: complex knots appear on the inside. The main goal of the game is to switch the outside button colors, without creating a knot inside. It seems impossible but...