Extreme Difficult Sudoku 2500

For those of you who aren't satisfied with regular sudoku, we've 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! It's totally free to play! If you solve every puzzle, you may be able to become a genius!?