Every Second Straight
Every Second Straight is a loop-drawing puzzle that first appeared at the 14th World Puzzle Championship (2005) in Eger, Hungary.
The puzzle is conceptually related to the earlier and better-known Every Second Turn, mirroring its alternating-constraint idea. However, instead of restricting turns, Every Second Straight imposes conditions on straight segments of the loop. Despite this surface similarity, the change in focus leads to a completely different solving strategy.
Rather than relying on local turn placement, solvers must reason about the global structure of straight segments and their parity along the loop. This shift creates new logical patterns and makes the puzzle feel distinct, even to experienced solvers familiar with Every Second Turn
The puzzle is conceptually related to the earlier and better-known Every Second Turn, mirroring its alternating-constraint idea. However, instead of restricting turns, Every Second Straight imposes conditions on straight segments of the loop. Despite this surface similarity, the change in focus leads to a completely different solving strategy.
Rather than relying on local turn placement, solvers must reason about the global structure of straight segments and their parity along the loop. This shift creates new logical patterns and makes the puzzle feel distinct, even to experienced solvers familiar with Every Second Turn
Rules
Draw a single continuous loop in the grid using horizontal and vertical line segments so that the loop visits every square exactly once. It should not cross or overlap itself. It goes straight at every square with a circle. There is exactly one square between two consecutive circles that the loop visits where the loop does not make any turn.
Click to see the answer.