What do you do if you have a long commute to your workplace and are not a fan of books and Candy Crush? You don’t have to sit and stare into space.

Here are a list of brain teasers you can easily play on your phone or tablet the next time you find yourself in a crowded train or bus with nothing to do. And some of them even have noble causes attached to them — they test your
cognitive skills, ‘measure’ your health and find out how mentally fit you are, among others.