Double Hit Bonus:
To get a Double Hit Bonus just fire right when a moving targets walks behind a stationary one or when two moving targets pass each other and they line up in one in front of the other (relative to you).
Exchange a Half of Life for 5 Seconds:
Pause gameplay and press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.
Exchange 5 Seconds for Half of Life:
Pause gameplay and press Circle, X, Right, Left, Right, Left, Down, Down, Up, Up.
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