Extreme Difficult Sudoku 2500

There are 2500 extreme difficult sudoku puzzles! Free to play! Heat Your Brain!

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!?