This page contains I-Ninja Hints for PC - Windows called "xPower-Ups" and has been posted or updated on Jan 20, 2010 by kayykz. Let us know what you think of this Hint by thumbs voting.
Whenever you kill an enemy in a rapid succession, the number to the right of the health bar increases by one up to 10. This represents what points you receive for killing an enemy, multiplied by the number displayed. This is useful in certain missions where a high score is required to earn the grade.
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