Move right three times and select the dragon. Time travel to the Black Woods and return to the witch. Talk to the witch: She will exchange the potion of invisibility for the fang of a wolf. Time travel to the house. Drop the decanter and the rake. Go to the yard and take the car wheel:

Go to the basement and take an empty glass retort. Time travel to the Stone Age. Move forward twice and talk to the top-left troglodyte: He wants the mammoth to be moved. Use the catapult wheel, moon walker wheel, wagon wheel and car wheel on the mammoth to receive the wolf fang from the troglodyte.

Time travel to the Black Woods and return to the witch. Give the wolf fang to the witch. Give the empty glass retort to the witch to receive the magic potion. Drink the magic potion and the invisibility magic will be added to the Magic Generator. Time travel to the fisherman's cabin. Enter the cabin and take the knife: