Normal sudoku rules apply. Draw 3 snakes which must each begin and end at a different grey spot. Snakes are lines which may move orthogonally and diagonally between cells. They may touch each other (or themselves), and can even cross each other, but they must not branch, share cells with each other, or enter cages. A digit on a snake indicates exactly how many times that digit appears on that snake. Eg: If there is a 5 on a snake, there are five 5s on that snake. One snake is a “German Whisper” line; along it, adjacent digits must differ by at least 5. One snake is a “slow thermometer”; along this line, reading from one end to the other, digits must always increase or stay the same. One snake is “entropic”; along it, any group of 3 adjacent cells must contain one low digit (1, 2 or 3), one medium digit (4, 5 or 6) and one high digit (7, 8 or 9.) Digits in a cage must sum to the small clue given in that cage. Digits separated by a V sum to 5.