Normal sudoku rules apply. Mus the mouse must reach the cupcake and Felix the cat must reach the escape hole finding paths through the maze. Individually, their paths must not visit any cell more than once, cross itself, or pass through any thick maze walls. As well as moving orthogonally, both Mus and Felix can move diagonally if there's a 2x2 space in which to do so, but may never pass diagonally through a round wall-spot on the corner of a cell. Importantly, the paths of Felix and Mus can cross each other. This can only happen on even digits and if it does happen, both paths MUST continue on to another cell in a straight line. Mus and Felix may only pass through black arrows if moving in the direction the arrow is pointing. An arrow always points to the smaller of the two values it sits between. Cells connected by a blackcurrant have a 1:2 ratio (one is double the other.) Not all possible blackcurrants have been given. Digits separated by a green grape have a difference of at least 5. Not all possible grapes have been given. For Mus, the path within each box must be a thermometer with the bulb being the first square entered and the tip being the last square in the box. Digits along a thermometer increase from bulb to tip. Repeat visits to the same box are considered separate thermos. For Felix, adjacent cells along the path must be of different parity (odd/even).