(view directly for a larger image)
or solve online (using our beta test of Penpa-Edit tools in linex mode where left click+drag draws lines and right click marks X’s on edges)
Author/Opus: This is the 395th puzzle from Thomas Snyder, aka Dr. Sudoku.
Rules: Form a single non-intersecting loop. Clues inside the grid represent the number of neighboring cells visited by the loop; if there is more than one number in a cell, each number should be represented with a separate loop segment. There is no 2×2 rule of Tapa in this puzzle.
See also this example:
Difficulty: 4 stars
Time Standards (highlight to view): Grandmaster = 6:45, Master = 11:30, Expert = 23:00