Infinite Math: Brain Puzzles
Famous problems, sharper mind
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Is π greater than 3.05—can you prove it? From legendary exam problems to classic puzzles, famous math to enjoy as a hobby. Turn spare moments into a brain workout.
That “I solved it!” feeling, all over again.
A math app for grown-ups who solve for pleasure—not for any exam.
From the wonder of primes and divisors to the crane-and-turtle puzzle, the Monty Hall problem, and even the legendary entrance exams of Japan's top universities—
a collection of beautiful problems that make you feel "numbers are fascinating."
■ Made for you if you
・love numbers and logic puzzles
・enjoy giving your mind a workout in spare moments
・want to know not just the answer, but the idea behind it
・are done with exams, but want to rediscover the joy of math
■ Six categories, 55+ problems (more added over time)
・Number Theory & Puzzles … primes, divisors, Fibonacci, perfect numbers, and more
・Classic Problems … crane-and-turtle, Monty Hall, the Königsberg bridges, Pick's theorem, and more
・Elementary Exams … ferris-wheel logic, seesaw puzzles, and other gems
・Junior-High Exams … work, travel, concentration, and counting problems
・High-School Exams … symmetric expressions, probability, Euler's prime-generating formula
・University Exams … legendary stumpers like "Is tan 1° rational?" and "Prove π > 3.05"
■ Highlights
・Daily Problem … one fresh problem to tackle each day
・Sessions … test yourself with five problems at a time
・Explanations worth reading … not just the answer, but the background and the thinking
・Interactive figures … trace the Königsberg bridges or Pick's theorem with your finger
・Progress tracking … solved problems are recorded; aim to clear them all
・19 languages … enjoy these problems in Japanese, English, Chinese, Korean, and more
Answers are simple multiple choice—and some figures come alive at your fingertips. Enjoy the world of numbers on your commute, on a break, or before bed.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Added 20+ new problems (now 83 in all)
• Fresh number wonders like "a rope around the Earth" and Ramanujan's 1729
• Plus legendary entrance-exam problems from Japan's top universities
The developer, kenta yamamoto, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- kenta yamamoto
- Size
- 7.8 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 18 more
- English, Dutch, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 kenta yamamoto.