Author/Opus: This is the 20th puzzle from guest contributor Joseph Howard.
Rules: Draw a snake (a 1 cell-wide path) in the grid whose head and tail are given by circled cells. The snake can touch itself diagonally, but cannot touch itself orthogonally or revisit any square. Besides the snake, the remaining cells must form exactly nine white areas, one of each size from 1 to 9 (in example, 1 to 5). Numbers in the grid must be part of white areas of the indicated size.
See also this example:
Difficulty: 3 stars
Time Standards (highlight to view): Grandmaster = 3:15, Master = 6:45, Expert = 13:30