Logic Masters Deutschland e.V.

Inspired by marty_sears Rat-Run puzzles

Rules:

Normal sudoku rules apply.

Aim of the puzzle: The frog is trying to make it back to the princess, but an eagle is out hunting for a slimey lunch. The frog must never be in the same region as the eagle, or it will be spotted. The frog must also collect each water lily on the way there to have a gift for the princess on arrival.

The Frog: The frog may only move to orthogonally adjacent cells in the puzzle. It also cannot pass over a log, or cross its own path. It is not affected by clouds. The frog's path is a valid Dutch Whisper line. This means that each pair of adjacent cells on the frog's path must differ by at least 4. The frog's path ends at the princess. It also cannot pass through the nest.

The Eagle: The eagle must only move when the frog moves, and the movement will be of the same distance in the opposite direction to the frog. e.g. If the frog moves left, the eagle will move right. The eagle can travel between opposite borders of the grid when prompted by the frog. e.g. If the frog's moves left from its starting position, the eagle cannot move right, so it will instead fly from r5c9 to r5c1. The eagle can fly over the logs, but cannot fly through a cloud. The eagle's path ends at the nest. It also cannot fly over the princess.

The eagle and frog may cross each other's paths, as long as they are not there at the same time. The eagle, the princess and the frog all share the same digit.

Quadruples: Every digit in a circle must be assigned to one of the surrounding cells.

SudokuPad link