"Snake puzzle" refers to many different things. To give you a useful answer, I need to know which one:
Common "Snake Puzzles"
Physical Puzzle: Wooden/plastic chain of blocks that folds into a cube/ball (e.g., "Snake Cube"). Solution: Search YouTube for "snake cube solution" + your piece count (27, 64).
Mobile Game:Snake (Nokia), Slither.io, Snake Rivals—no "puzzle" mode typically.
Video Game Level:Metal Gear Solid 3 (snake eating), The Witness (snake-like line puzzles), Portal 2 (light bridge), Zelda (snake statues).
Browser/Flash Game: "Snake" variants with maze/puzzle elements.