Normal Sudoku rules apply. A 1-cell-wide python, which may not touch itself, even diagonally, begins and ends at the red squares. Digits on the python form a palindrome, with the purple square at the midpoint. The grey cells (stones) are NOT python. Each stone shows how many of its surrounding cells (INCLUDING the stone itself) are NOT python. All stone digits are different. The blue cells may be python. Each blue cell shows how many of its surrounding cells (INCLUDING the cell itself) are python. ALL possible coloured cells are given.