It's important to keep your mind active throughout the day - and there's no better way to achieve this than solving a challenging brainteaser . It prompted one brainteaser enthusiast to share their favourite mind game - saying many people struggle to solve it and simply give up on it. In response to the Reddit thread, 'What are some of the best brainteasers in the world ?', they said: "There are five bags of gold that all look identical, and each has ten gold pieces in it. One of the five bags