Hidden Pictures
Go to where Zelda is met for the first time. Then, look into the window
on his left, as you enter. Pictures of Yoshi, Princess Toadstool, Mario,
Bowser and Luigi can now be seen. Look from different angles to see them
all. Throw something into the window with Mario to receive 20 rupees. Throwing
something into the other window will result in a lit bomb being thrown
back at Link.
Unlimited Money
Go to the Lost Woods and find the Skull Kid who is alone as adult Link.
Then, lock onto and kill him will the Big Goron Sword, and he will give
you 200 rupees. Enter a door, return, and repeat the process to collect
an unlimited amount of money.