オカンからの手紙　ひらめき脳トレクイズ is a free game for iPhone developed by KYOUKO HAMADA. The game revolves around solving the mystery notes left by your mother, challenging your brain with clever quizzes. Each puzzle consists of a short message that you need to decipher. The game presents you with the memo and you have to think of the answer before tapping on the letters at the bottom of the screen to provide your response. If you answer correctly, you proceed to the next puzzle.

This game is perfect for those times when you're looking for a fun and challenging activity to pass the time. It can be enjoyed during study breaks, on your daily commute, or even as a conversation starter with friends. You can also use it to create entertaining video commentary. Can you solve all of your mother's mysterious notes?