By Hasna Haidar at Carphone Warehouse 

Whether you are a start-up owner or a business leader, your mind is the best tool you can use when creating your business empire.

No matter how much of your capital is directed towards personnel, marketing or attracting further investors, neglecting your mind can spell catastrophe. Which is why giving it challenges like optical illusions quizzes, difficult crosswords and strategy or problem-solving games might just be the secret key to business success.