Draw a loop visiting all cells exactly once, by joining adjacent cell centres with horizontal and vertical line segments. No corner is formed between two consecutive identical markings. Exactly one corner is formed between consecutive different markings. Turns on the markings themselves are ignored by the previous two rules.
Factor Lines Sudoku by Philip Newman
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(This post is part of the Genuinely Approachable Sudoku (GAS) series.) Each
line is this intriguing puzzle is connecting pairs of factors, so thinking
of...
2 hours ago