Metroid: Zero Mission Cheats :
Cheats - Completion bonuses
by Unregistered Apr 30, 2005
The only way to defeat it is to use your missals. When the Underground Worm opens his eyes, immediately shoot it at least once before it closes. Do this two more times to defeat it. Note: If you are not quick enough to defeat it, it will run away. Also, if you defeat the first Underground Worm, you will get the Charge ability.
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