Spot the Difference
- Odd and even cells
The brief
- Normal sudoku rules apply.
- Connect each pair of matching coloured spots with a snake. Snakes may only move orthogonally through the grid, not diagonally. They may touch each other (and themselves), but cannot share cells.
- Each pair of adjacent digits along a snake has the same difference, but this 'difference value' may be different for different snakes.
- A grey square contains an even digit.
- A black dot connects two digits with a 1:2 ratio (one is double the other.)