Normal sudoku rules apply. Draw a snake (a one-cell wide path) into the grid which does not touch itself orthogonally. Areas not covered by the snake form 8 separate regions, one of each size 1-8 ('eggs') which, in turn, may touch one another diagonally but not orthogonally. Adjacent cells on a green line must contain one snake cell and one egg cell AND these cells’ digits must differ in value by at least 5. If a circle is in an egg, it gives the count of cells in the egg. If a circle is on the snake, it gives the number of snake cells “seen” by that circle, including itself (ie the number of contiguous snake cells extending horizontally and vertically from that cell, including itself).