Logic Masters Deutschland e.V.

Rules:

• Place the digits 1-9 once each in every row, column and box.
• Each circle represents the head of a snake made of orthogonally connected cells that forms a prime number when the digits are read from the snake's head to tail. Digits may not repeat within such snakes and the snakes do not overlap.
• Clues outside the grid indicate the digit in the Nth cell in the corresponding direction, where N is the digit in the first cell seen from the clue.
• Box borders divide each blue line into segments with the same sum. Different lines may have different sums.
• Digits in cells separated by X sum to 10.
• Digits in cells separated by a black dot are in 1:2 ratio.
• Digits in cells separated by a white dot are consecutive.
• Negative constraints don't apply.
• The digits that are not on any snakes sum to 24.
• Hint: Feel free to assume that any number without single digit factors is prime.

Solve the sudoku here:
SudokuPad