Ice Beam: -Description: The Ice Beam changes Samus' beam to a freezing shot, any enemies struck by the beam will be instantly frozen. Shoot the target again to unfreeze it. While an enemy is frozen, Samus can jump on top of them without taking damage. You'll need the Ice Beam when venturing into Tourian near the end of the game, as it'll be critical when facing the Metroids.
Wave Beam: -Description: Gives Samus' arm cannon the ability to fire a series of energy balls that fly in a wavy pattern. The pattern of the shots can greatly help in destroying smaller enemies and gives Samus a wider firing range.
Long Beam: -Description: Initially, Samus' arm cannon's range will only be quite short, but once this weapon's found early in the game, her shot range will reach the edge of the screen for any weapon type equipped. You'll also be treated to a new sound effect for Samus' beam shots.
Missiles:-Description: Missiles litter the corridors and shafts of Zebes, you'll be finding plenty of these while exploring the vast caverns. Each Missile Tank found adds a further five missiles to Samus' maximum arsenal. You'll be able to find a maximum limit of 255 Missiles.
Energy Ball: -Description: Restores a portion of Samus's energy.
Energy Tanks:-Description: This will give Samus an extra 100 energy units above her current maximum health level - definitely worth searching for. You'll be able to carry up to a maximum of six energy tanks, but eight are hidden throughout the game.
Morph Ball:-Description: This special ability will allow Samus to crouch down and assume the shape of a small ball. She can roll around while in the ball form, allowing her to crawl through narrow tunnels. You'll also be given the ability to plant bombs once you've found the Bomb upgrade.
Bomb: -Description: While in the Morphing Ball mode, Samus can plant bombs that can damage enemies within range. The bombs can also break open hidden tunnels within certain rooms.
High Jump Boots: -Description: This allows Samus the ability to jump much higher than her normal jumping height.
Screw Attack:-Description: This deadly ability allows Samus to charge up energy in her body while performing a somersault jump. When Samus jumps, she'll begin flashing indicating that the Screw Attack's in action. Any enemies coming in contact with Samus will be obliterated.
Varia Suit: -Description: The Varia greatly enhances Samus' Power Suit, reducing damage inflicted by enemies by half.
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