To unlock Four Screen Mode, insert the following code at the start screen: Up, Right, Down, Left, Run.
To unlock an in-game sound test that lets you listen to all of the game’s music, insert the following code at the start screen: II, Select, Up, Run.
To unlock a level select option, insert the following code at the start screen: Up, Left, Down, Right, Run.
To see the game’s ending automatically without actually having to beat the game, insert the following code at the start screen: Up, Up, Down, Down, Left, Right, Left, Run.
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