Right after you turn the game on, press and hold Left and Down and Select. "Continue Mode" will appear on the screen. The number of continue is determined by the following equation: your score (at the time when you were first kill) divided by 1,000,000 points plus 3
At the title screen, press I + II and then quickly hold RUN and press SELECT to reset the game. Immediately hold RIGHT + DOWN + SELECT until the title screen appears. "DIFFICULT MODE" will appear on the screen if done correctly.
Contributed By: rockman87b.
Easy mode (Double power and units)
At the title screen, press I + II and then quickly hold RUN and press SELECT to reset the game. The hold Right + Up + Select until the title screen appears. "EASY MODE" will appear on the screen if done correctly.
During play, hit Button 1 then hold Run and press Select to reset the game. Immediately hold Left + Up + Select until the title screen appears. You'll be in Music Mode; you can play any music in the game by pressing I or II.
To kill yourself, pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, II, I.
Contributed By: oblivion from aoc.
Beat the boss of any level with full health remaining and you get 10,000 bonus points.
Contributed By: SSnesVegita.
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