Some of our products include plastic discs for you to use to scratch off the challenges. If you do not have a scratcher, please use something else with a smooth, plastic edge, like a credit card or guitar pick.If you are still having difficulty, please send us photo/video proof of the damage, so we can look into it.If the book is defective, we will send you a replacement item! If the product is not defective, we will send you a screenshot of the challenge you are needing help with. Please reach out to us via Live Chat or at support@theadventurechallenge.com with your order number, a photo or video of the damage, and what product and challenge numbers were not working, and we will be happy to help you! Please note: Damage due to the challenges being scratched by a coin, key, or object that is not recommended will not be eligible for a claim.