Jigsaw Sudoku
Hard
00:00
Classic
About hard jigsaw sudoku
Hard jigsaw sudoku introduces the techniques that make this variant interesting. Naked and hidden pairs become necessary, and you'll encounter situations where the Law of Leftovers gives you information that no standard technique can provide. When a region overlaps a band of rows, the digits spilling out match the digits spilling in from other regions. Learning to spot these overlaps is the key to breaking open stalled hard puzzles. Expect solve times roughly 30% longer than hard standard sudoku.