Book excerpt: Test your mind and build your critical thinking skills with these fun and challenging brain teasers and riddles. Riddles and brainteasers can be found throughout history and around the world. This book collects 190+ challenging mind-benders. You can use it for fun, to build your critical thinking skills, and to sharpen your mind. You can also use it as part of banking, tech, and case interview preparation, as brain teasers are used as part of job interviews in management consulting, banking, and tech. Even if you are not asked a brain teaser question during your interview, using this book of brain teasers, with answers and explanations as part of your job interview preparation, will keep your mind sharp and help you enhance your critical thinking skills. It is like going to the gym. Sticking to a routine of training your mind makes you an overall stronger performer. The brain teasers are broken into three sections: easy, medium, and hard. Each section is followed by the solution to each brain teaser, along with an explanation of how to solve this brain teaser; a unique extra step we added to help you become an even stronger critical thinker. From an introductory section explaining the rules and outlining what’s to come to the brain teasers and riddles which progress through Easy, Medium, and up to a final expert level (Hard) - this book will help you enhance your critical skills and ability to think creatively. Get ready to sharpen your mind with this ultimate book of brain teasers.