The Persistence of Memory by Prasanna Seshadri
or solve online (using our beta test of Penpa-Edit tools using a composite mode where left click inside cell shades square, left click + drag draws line segment, right click inside cell adds dot, and right click on cell edge adds an x.)
Theme: Tetrominoes
Author/Opus: This is the 186th puzzle from our contributing puzzlemaster Prasanna Seshadri.
Rules: Draw a snake (a 1-cell wide path) from one dot to the other by moving horizontally or vertically between adjacent squares. The snake cannot touch itself, not even diagonally. All highlighted regions must be visited by the snake, and may be re-entered. If two or more highlighted regions have the same shape and orientation, then how the path passes through those shapes must be identical.
Difficulty: 3 stars
Time Standards (highlight to view): Grandmaster = 4:45, Master = 7:30, Expert = 15:00
Solution: PDF
Note: Follow this link for other Snake puzzles. More Snake puzzles and variations can be found in Snake and Variations by Serkan Yürekli.