Prime Logic

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.