Enter the Carnival and go the far right. Then, go up and tap the red flashing box you find to unlock the gizmo. The gizmo allows you to go to all the round areas of the path. Note: You will teleport randomly.
Enter the carnival grounds and go as far left as possible. Then, go up to find a cat. When you get to the cat, go down slightly and to the right slightly to find a ball of yarn. Keep tapping the ball of yarn until it moves to the cat.