Steal Anything:
You can steal from any SOP by picking up the weapon or item you want. Then quickly try to circle around the clerk area off in the corner. Make sure his eyes aren't on you then walk out. If you have managed to avoid his eye contact you now have that weapon. Be advised: Do not go back in the shop or the clerk will shoot a laser beam at you and you will suddenly die.
Weird warp:
Pay to play the fishing game and reel in just one fish.
When asked to continue, select "No."
When it says "You have to have more passion," simultaneously press A, B,
Start and Select for the quick-end. Select "Return to Game."
You will be at the empty fishing pond. Jump in and swim off the left side
of the screen (You must have Flippers). The graphics of the Raft Shop will
be scrambled. Go down 1 screen to go outside and the graphics will return
to normal. Note: There is no advantage in doing this code, it is just for fun.
Change the music:
Select an empty file and enter ZELDA as your name. It must be all capital
letters to work. The background music of the Player Select screen will
change.
Chicken feed:
First get the Flippers and the Rooster. Go to the Raft Shop and ride
the raft left to the second waterfall. Drop down the right side of it and
press Select as soon as you disappear off the screen to see the map.
Return to the game and you'll land on an island. You can now swim around
and collect all of the items. Use the Bracelet to grab the rooster and you
can collect the floating items.
Single screen warp:
When you find an obstacle that you cannot pass, go back to the left or
right one screen. Stand on the edge of the screen. Just as you go to re-enter
the screen with the obstacle, press Select. With proper timing,
the map screen will appear. When you return to the game, you will
be one screen over at the same spot. If you get stuck, don't save, try again!
Explosive arrows:
Equip both the Arrows and the Bombs, then fire them simultaneously.