If your energy gets drained, press the A and B buttons at the same time 3 times in a row. If done right, your character should get back up with full energy.
Pacific Island Password
At the password screen, press Left 2 times, Down 2 times and enter the Japanese character. Then Up 1 time, Right 1 time and enter the Japanese character. Now repeat that same pair of Japanese characters 8 more times. Then for the final two characters, press Up 1 time, Left 6 times and enter the Japanese character. Right 6 times, Down 1 time and enter the Japanese character. Hit "End" to start on the Pacific Island.
Secret Japanese Soldier Password
At the password screen, press Down 1 time and enter the Japanese character 20 times. Now hit "End" and you'll start in a Jungle. Go left, enter the hut and leave it right away. You'll now be in a different area. Go left again to enter a jungle. Start counting the trees and hold Up in the middle of the 16th & 17th tree. If done right, you'll enter a secret area with a Japanese soldier.
Treasure Room Password
At the password screen, press Left 4 times, Down 3 times and enter the Japanese character 20 times. Now press End and leave the password screen to start on the Treasure Room.
Clear the screen of enemies
While playing the game, you can clear the screen of enemies by just pressing Select to go to the menu screen and then exiting it. If done right, all the enemies will be gone. You can do this as many times as you wish.
There are three parts in the game where you must use the Famicom's 2nd controller built-in microphone, the Pachinko Parlor, the Karaoke Bar and to reveal the map. If you don't have the microphone available, you can alternatively press Down + A at the same time on the second controller to manually switch from microphone input to controller input. That way when you are required to use the microphone, just press the A button on the second controller and that will qualify as using the microphone.
Warp to the last room without playing the game
To reach the very last room (the treasure room) without playing the game, just press the A button (the punch button) 20 thousand times on the title screen. You will physically see the character punching the air, you can take breaks and move around if you wish, but you must punch 20, 000 times. If done correctly, you'll be warped to the treasure room without having to play the game.
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Have We Been Fooled?
You can submit a problem report for any non-working or fake code in the lists above.