Sudoku Puzzles - Hard #3 & 4

The sudoku puzzles shown below are "hard" difficulty. These puzzles are different than the easy and medium level puzzles. The hard sudoku puzzles below use 4 x 4 grids and they also use the numbers 0 through 9 as well as the letters A through F. That means that there are 16 different numbers or letters for each row, column and 4 x 4 inner grid. There are two sudoku puzzles on each page. Both sudoku puzzles and the solutions can all be printed on one page. Simply click the "Print This Puzzle" button below. After clicking, a new box will pop up with the puzzle shown, ready to print. Enjoy your free printable sudoku puzzles.