Cheaty

Pitfall:
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You can jump on the Alligators head but avoid his gnashers.

River Raid:
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To maximize your points, blow up the fuel tanks whilst
you are refueling.

Kaboom !:
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Catching bombs in the top bucket is unecessary, usage of
the bottom two is adequate.

Fishing Derby:
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Hitting the SPACE BAR (FIRE) after you've hooked a
fish, will speed up the catch, thus helping you avoid
the sharks etc.