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.