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
Solution code: Row 9. Left to right. No gaps between numbers.
on 31. October 2021, 22:59 by uvo_mod
Labels angepasst.
on 29. October 2021, 00:43 by BHUNTER47
I loved this puzzle. Great logic, unique, and when I finally figured where to progress after exhausting all other logic, it made my day.