or solve online (using our beta test of Penpa-Edit tools; in default linex mode: left-click+drag draws line, right click marks X on edge)
Theme: Sequential Logic
Author/Opus: This is the 33rd puzzle from our contributing puzzlemaster JinHoo Ahn.
Rules: Draw a single loop in the grid which may cross itself orthogonally, but otherwise does not touch or retrace itself. The clue numbers to the left/right of the rows indicate the number of squares visited by the nearest section of the loop that travels horizontally in the rows. The clue numbers to the top/bottom of the columns indicate the number of squares visited by the nearest section of the loop that travels vertically in the columns.
Also, see this example:
Difficulty: 4.5 stars
Time Standards (highlight to view): Grandmaster = 8:30, Master = 14:15, Expert = 28:30