10 quiz and trivia games for Android and iPhone

How long has it been since you last gave your brain a proper workout? Can't remember? Well, then you might want to give these quiz and trivia games a try. We have picked 10 of them, available on both Android, iPhone, and iPad, with questions ranging from simple and casual to fiendishly challenging. All of them are free or have a free version available, so don't hesitate to check out every single one of them. Multiplayer is also a feature present in most of the titles we've selected, meaning that you may challenge your friends or people from around the world. Take a look by flipping through the slideshow below!