Our Hard level online sudoku puzzles:
On SudokuLovers.com you Can play high-quality Hard level web Sudoku, The difficult Puzzles are daily curated and are forever free! We also have a daily challenge so you can keep your mind sharp!
Our Hard level Sudoku puzzles usually contain around 25 - 35 given numbers and will require you to use techniques and special methods in order to complete the puzzles. Once you master the Hard level advance to the Evil level Sudoku puzzles, Where only the brave walk!