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(En)Tropical Snake 6x6 Primer
 by damo_89
This is a 6x6 primer puzzle for the full 9x9 puzzle with the same rules.

Normal 6x6 sudoku rules apply.

Snake: Starting from the green circle in R6C1 draw a snake, a one cell wide series of orthogonally connected cells that does not branch or touch itself even diagonally. The snake can't exit and re-enter the same box of the sudoku.

Circles: All circles are part of the snake, and the digit in the circle is the number of snake cells in that 3x2 box of the sudoku. (For clarity, this also applies to R6C1)

Entropic Line: The snake is an entropic line. Any sequence of three digits on the snake will contain one low digit (1, 2), one medium digit (3, 4) and one high digit (5, 6)

Projected Snake Sums: Clues outside the grid give the sum of the digits on the snake in that row or column of the sudoku.