Extreme Difficult Sudoku 2500
For those of you who arent satisfied with regular sudoku, weve put together a seriously perplexing puzzle collection!
There are five categories to choose from—Normal, Cross, Jigsaw, Cross Jigsaw and Inequality—each with 500 puzzles each, for a total of 2500 puzzles!
Its totally free to play!
If you solve every puzzle, you may be able to become a genius!?