Diagonal 3s
Hard
Used by Smart Hint
Two 3s touching only at a corner: the two outer sides of each — the ones away from the shared dot — are all lines.
- Edge the technique adds
- Cells that establish the pattern
How it works
- These 3s don't share an edge, only a dot — but that dot's four edges are exactly these two cells' sides: the upper 3's bottom and right, the lower 3's top and left.
- Every dot carries 0 or 2 lines. It can't be 0 here: that would blank two of the upper 3's sides at once, leaving it only two to work with.
- It can't be the upper 3's two either — that blanks both of the lower 3's sides at the dot and strands it the same way.
- So the two lines at that dot are one from each cell. Each 3 therefore has exactly one line among its two sides facing the dot, which means its single blank side is one of those two.
- Both OUTER sides of each 3 are lines: the upper 3's top and left, the lower 3's bottom and right. Four edges from two clues that never touch.