• 3 x 3 x 3 Concave rubik cube is the combination puzzle.
• This cube is fast with an excellent corner, this is very flexible and very smooth to rotate.
• It helps to improve the hand-eye coordination, mathematical and logical thinking.
• This cube is a brainteaser, which improves cognition performances, enriches observation, coordination and recognition agility.
• This cube puzzle helps to increase the thinking power and develops intentional mindset.