Double
Rules[edit]
Draw a single loop consisting of alternating horizontal and vertical line segments. All cells where the loop makes a turn and both segments are of equal length are marked with numbers showing the length of those segments.
(Rules from WPC 2015 IB, example by EctoPlasma)
History of the puzzle[edit]
Probably first appeared on WPC 2015/Round 4. Author of the puzzle was Svetlozar Stefanov (Bulgaria).
Appearances in the past WPCs[edit]
- WPC 2015/Round 4 by Svetlozar Stefanov