Backyard Football - Platform: Gameboy Advance

Great Sacks:
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When playing defense, press R and you will become the person in front
of the ball. When the ball is snapped, press A for a burst of speed. 
The blocker will fall over, and you can tackle the quarterback. 

Good Defense/play Ruiner:
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Choose Field Goal Hurry in the 'K' section of the playbook. This is the
ultimate play, because if you are the person farthest away from the ball, 
you should go two seconds back from your position. The A.I. teammates will
go for the QB and other players, while you can race for the people who got
the ball from passing You may want Kiesha Phillips as your center.