Normal sudoku rules apply. The Hare and the Tortoise must race in orthogonal or diagonal steps, and must not enter ponds, or cross or overlap each other or themselves, apart from at the finish line, where both their paths end. The Hare must enter every 3x3 box exactly once each (including box 9 - starting in box 9 does NOT count as entering it). The Hare's racing line will be a valid “Fast Thermo” - ie. digits along it increase by at least 3 at a time, but the Hare has a nap at every box border and the Thermo may begin again on any digit in the next cell. The Tortoise's racing line will be a valid Slow Thermo - ie. digits along it may not decrease. The Fox declares the winner by displaying a digit that does NOT appear on the winner's racing line. Digits separated by the Duck sum to 5.