ポルトガル語のたまご is an educational iPhone app developed by ryosukE soejimA. The app runs smoothly and offers a review feature for efficient studying. Users can solve numerous problems, with incorrect answers being recorded and displayed for focused revision. Additionally, the app allows users to review only the questions answered incorrectly in a separate section. Even during review sessions, questions can be solved randomly. The app enables users to seamlessly continue their progress from where they left off, ensuring a smooth learning experience. With the ability to mark questions for further review manually, users can optimize their study sessions. The app also offers the convenience of enlarging images and allows users to progress to the next question without the need to backtrack, promoting efficient learning.