To latch onto a human's leg, click on it with the left mouse button as it passes. The leech likes certain parts of the leg more than others. He particularly likes open cuts and feet more than ankles. And he dislikes bandages, toe nails and boney parts of the foot. To feed from human flesh and blood, once latched to the limb, repeatedly click the leech with the left mouse button. To keep from starving, the leech needs a lot of blood, enough to fill his bar every time a foot comes by. However, you don't want to overfeed him. Whenever the word 'REST' appears, the leech needs to take a break from sucking blood, so don't click him when he is resting.