This is the perfect puzzle pack for hours (and hours) of puzzling fun. Are you up for a challenge? Then test the old grey matter with these two unique Brainteaser puzzles. Made by premier Netherlands puzzle inventors Guido Lap & Oskar Van Deventer. The pack comprises two unique challenges which will be solved in minutes or hours, years.... Brainstring Move the coloured buttons over the segments of the cube & position: Two of the same colour on every segment Three of the same colour on every segment Four of the same colour on every segment without entangling the strings! All strings are interchangeable so every combination is possible. Tip: Make a brain-twisting knot for a friend. Planets The planets must be rotated in such a way that each side of the pyramid is the same colour. A planet can only be rotated if it is in the right position in relation to the other planets. Planets can lock & release each other. Work your way around the planets until you reach your goal.