Logic Masters Deutschland e.V.

Standard sudoku rules apply: Fill the grid with digits from 1 to 9 so that every row, column, and 3x3 box contains each digit exactly once.

In addition, there is a snake in the grid, with its head at the green cell on the left edge and its tail at the one in the top right corner. A snake is a 1-cell wide path of orthogonally connected cells, which may not touch itself, even diagonally.

If you add the numbers along the snake, starting at the head, all of the partial sums are prime numbers. For example, if the snake starts with 2, 9, 8, and 4, the first four partial sums would be 2, 11, 19, and 23, which are all prime.

This puzzle is not intended to test your ability to compute or memorize prime numbers, so here's a list of all primes up to 127:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127

The puzzle is available on Penpa.