Extreme Difficult Sudoku 2500 descripción

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!?