Quintillions of Sudoku Problems For All Skill Levels!
Want to know more about sudoku? Check out the History section!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!