QUICK GUIDE
Enter clues
Select a cell, then choose a number. For an exact puzzle, enter at least 17 clues. Or enter only the numbers you want to keep and build a unique puzzle around them.
LIKE THE APP
Build around my numbers
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Enter one or more numbers you want to keep. We complete a valid grid, preserve your numbers, then remove other values until the puzzle has one unique solution at the selected difficulty.
Every number you entered is preserved. We only add/remove generated clues while keeping one unique solution.