Draw the board shown in the illustration or use
'n' Play PDF Version.
The goal is to draw a path from A to B so that it goes through each
empty square of the board only once and has no self-crossings. Your
path must go horizontally and vertically (never diagonally), and it
has to avoid the four squares with the mushrooms in them.
There is an additional condition: the second square of the path must
be exactly under the A square as shown in the illustration.