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NARC
Extra Continues:
On the title screen press and hold Select, A, Up, and B then Start.
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Ninja Gaiden
Easy Kills
To kill any boss in a single blow, use the jumping slash. This technique is extremely powerful and only uses 5 magic points.
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North and South
At the beginning of the game, let the credits roll. When the only one visible on the screen is the guy on the horse with the bugle, press Up, Up, Down, Down, Left, Right, Left, Right, A, B, Start. The sound test
screen will show up, and one of the boxes will be labeled
"Operations". Highlight the five little boxes here by moving the control pad. Press A to begin the particular operation.