Logic Masters Deutschland e.V.

This is my first time making a puzzle with a "snake" or "fog of war". I hope you enjoy it!

Solve online: CTC

Rules:

Normal sudoku rules apply. Place the digits 1 to 9 in each Row, Column, and 3X3 box.

Draw a snake through the grid beginning at R1C1 and ending at R9C9. A snake is a one-cell-wide path of orthogonally connected cells that cannot branch or touch itself, not even diagonally. The snake cannot enter the same 3X3 box twice.
The snake acts as both a parity line and a region sum line, i.e. adjacent digits along the snake have a different odd/even parity, and digits along the snake sum to the same value in each 3x3 box the snake passes through.

Gray diamonds must appear on the snake. The digit inside a gray diamond counts the number of snake cells in the corresponding 3X3 box.

Digits in cages must not be repeated. Digits in cages sum to the small number in the top left corner of the cage (if given). In addition, cages are either fully on the snake or fully not on the snake.

Finally, The grid is covered in fog. Placing the correct digits reveals cells in the surrounding 3x3 area.