Namco Museum - Gameboy Advance
Make the Galagas stop firing
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Just like in the arcade version of Galaga, you can make the
enemies stop firing missiles. In round 1, kill everything but
the two left flies on the bottom row. Let them fly around for
about 15-20 minutes, until they stop firing their missiles.
Kill them, and for the rest of the game, none of the enemies
will shoot at you.
Dig Dug: Pump faster
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Go towards an enemy and continuously press A.