Magic Container Lady
The Magic Container Lady is a character found in the Hidden Town of Kasuto in The Adventure of Link. Link's interaction with her depends on how many Magic Containers he has collected. If he has found all three hidden throughout Hyrule, she will allow him to enter the house and claim a fourth container, maxing out Link's magic potential. Should he have missed one or more, she will block the way, implying that he needs seven to pass.