Our ECG practice cases are split into six levels, based on increasing difficulty. We encourage you to gradually advance through the levels at your own pace, so that you can first build the necessary ECG fundamentals that will be necessary later on as you continue to progress. Levels 1-3 will help you to build a foundation of knowledge and skills, while levels 4-5 provide a higher level of difficulty and will challenge you to think critically. We’ve recently added level 6, which has a particular focus on electrophysiology cases, and will be of interest to those interested in the diagnosis of advanced cardiac electrical abnormalities. We hope that you enjoy these problems, and that they will better prepare you for cases that you encounter in your clinical practice.