The worldâs best selling toy, a 3D mechanical puzzle, Rubikâs cube has perplexed the human brain for years. They say playing the game improves your IQ and strategic ideation. No matter how many times youâve cracked it in the past, this time around the game will have the last laugh. Because, those cubes youâve been cracking are nothing compared to the twelve-sided Rubikâs Cube puzzle. Itâs available for $49.90.