If you play with the numbers in one place and the adjacent numbers become (5, 10, 15), the panel disappears and all disappear in a chain, which is a great success! The answer is only one place, so the operation is very easy! Where can I mess with everything? It is a brain training app that reads ahead and thinks. 100 questions are prepared from the beginning, but if you are addicted to it until you are not satisfied, we will prepare additional questions.