Logic Masters Deutschland e.V.

Normal sudoku rules apply.

There is one snake in the grid. The snake consists of a single path of orthogonally connected cells. The path never splits up.

If you read the digits on the snake from one end to the other, the digits form a palindrome. (It’s the same digits if you read it forwards or backwards.)

A number outside the grid shows the sum of all cells in that row/column that is on the snake.

The number in a cell with a circle is the number of surrounding cells, including the cell itself, that is on the snake. (So a total of nine possible cells.)

A number in a cell with a square is the number of surrounding cells, including the cell itself, that is NOT on the snake.

If there is a black dot between two cells, one of the cells has to be twice as big as the other.

Not all circles, squares and black dots are necessarily given.

The puzzle:

solving online: f-puzzles