These are the weapons of Metroid.  Check out my walkthrough to fin out were these items are.
Maru Mari- This allows Samus to morph into a ball.
Missile Box- Adds 5 missiles to your missile inventory.  Allows you to shoot missiles.
Energy Box: Adds 100% more life to your total life.
Long Beam- Allows you to shoot your power beam much farther.
Bomb- Allows you to set bombs when your in ball mode.
Ice Beam- Allows you to shoot ice and freeze enemies.  Cancels out the wave beam.
High Jump Boots- Allows you to jump higher.
Varia Suit- Damge to Samus is halved.
Screw Attack: When you spin, you can damage enemies.
Wave Beam- Makes your beam wave.  Cancels out the Ice Beam.

Those are the weapons of Metroid.
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