Prime Logic
Naoki Chiba Games iPhoneiPadiPod touch
Prime Logic is a free Games app for iPhone and iPad by Naoki Chiba. Requires iOS 17.0. Updated June 24, 2026.
- Price
- Free
- on the App Store
- Size
- 12 MB
- Age 4+
- Updated
- Jun 24
- 2026 · v1.2
Screenshots
About Prime Logic
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.
What’s new
Version 1.2 · Updated June 24, 2026
- Added Daily Challenge: a new puzzle every day, with streak tracking to keep your momentum. - Added English language support. - Stability and internal improvements.
App privacy
The developer, Naoki Chiba, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers: Device ID
- Usage Data: Product Interaction, Advertising Data
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Identifiers: Device ID
Used for: Third-Party Advertising, Analytics
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Usage Data: Product Interaction, Advertising Data
Used for: Third-Party Advertising, Analytics