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Half of them are classic Jigsaw Sudoku puzzles, but the other half are variants of ...
Half of them are classic Jigsaw Sudoku puzzles, but the other half are variants of Jigsaw Sudoku. All in all, you get:
Jigsaw (or irregularly shaped) Sudoku puzzles share the same rules with classic Sudoku. The only difference is that the nine nonets are, well, irregularly shaped.
This makes the puzzles slightly harder than the original Sudoku and surely more entertaining, because every puzzle has a unique nonet design and therefore, they can never become boring.