This app, BrainFree, presents a quiz challenge with 50,000 true/false questions categorized into five general knowledge areas. The goal is to answer correctly within a 15-second time limit. Note that some questions might have varying interpretations. The categories include past exam questions and cover a broad range of topics to enhance your knowledge. Specifically, the categories are: Geography, Science and Technology, General Culture, English (including 8,000 words to improve vocabulary), and History. A Medicine category is also included.