Quintillions of Sudoku Problems For All Skill Levels!
Sudoku Republic, hosting over 18 quintillion puzzles! (...yeah, that's a real number)This is a 4x4 Sudoku puzzle in which the numbers 1 through 4 must
appear exactly once in each column, row and 2x2 box. There are many different sizes
and variants of the classic sudoku puzzle, many of which are represented in this website.
Want to improve? Take a look at our tutorial pages. You may find them very helpful!