Slalom aka Suraromu problems (rules) are notoriously soft against uniqueness logic. For those not in the know, uniqueness is the label for the kind of logic which assumes that the puzzle is correct and has exactly one solution. This particular problem isn't susceptible. Much.
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