Idiopathic pulmonary fibrosis (IPF) is a chronic, progressive form of interstitial lung disease and the unique Velcro crackles commonly seen in patients with IPF are an indicator that further investigation is required. The IPF Sound Challenge allows you to practice identifying various respiratory conditions, including IPF. After each recording you will be asked to identify the patients condition from four options. The correct answer will be displayed as well as an option to listen to that sound again or continue on to the next sound. Your overall score will be presented as a percentage at the end.