Prime Logic
Prime Number Brain Puzzles
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
New: a Daily Challenge with streaks - plus full English support!
Prime Logic is a collection of brain-teasing puzzles built entirely on prime numbers.
[ Prime Place ]
A fresh twist on Sudoku. Instead of 1-9, you place the first nine prime numbers (2, 3, 5, 7, 11, 13, 17, 19, 23) so no row, column, or 3x3 block repeats. There is a hidden beauty, too: every line always adds up to 100. Three difficulty levels, freshly generated each time.
[ Prime Sums ]
A cage puzzle (Killer Sudoku) using only primes. Fill each dotted cage so its numbers match the target sum. Choose from 4x4, 6x6, and 9x9 grids across Easy / Normal / Hard, with 300+ handcrafted stages.
[ Daily Challenge ]
A new puzzle every single day. Keep your streak alive and beat your best run.
Features
- Notes mode for jotting down candidates
- Hearts and hints to support your solving
- Clean, distraction-free design
- Universal app for iPhone and iPad
Sharpen your mind with the elegance of prime numbers.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Added Daily Challenge: a new puzzle every day, with streak tracking to keep your momentum.
- Added English language support.
- Stability and internal improvements.
The developer, Naoki Chiba, 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:
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
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
- Naoki Chiba
- Size
- 12.5 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 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 Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- 広告を削除 $0.49
- Copyright
- © 2026 JT Software
