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!?
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