There are three different weapons: the 
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Chainsaw
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 , 
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Pistol 
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,
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and the 
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Sniper Rifle
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. Press the 
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Keys 1
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,
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2
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,
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3
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 to change from
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one weapon to another. Use the Chainsaw for Tubbies wich
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show up in a 
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very close
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 distance (in front of you), the Pistol
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to shoot all Tubbies in a 
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medium distance
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 and the Rifle for
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all Tubbies in the 
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far distance
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. The aiming cross shows you
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the available area for every weapon you choose.
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Watch out for ammo! If you're out of it, just press 
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SPACE
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to 
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reload
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 your weapon. The Chainsaw does not need any
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ammo. Earn extra score by placing 
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Headshots
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!
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Good luck!