Erase lines to make labyrinth pathways. Starting with the left horizontal line, erase lines in circles 1, 2, 5, 6 and 7. Erase a part of circle 4, as shown here.
When erasing, remember to make the pathway's size equal to the size of the spaces within circles.
Erase the vertical line in the first circle, and leave the rest of them untouched. Erase parts of circles 3, 5, and 7.