Metroid II: Return of Samus/Upgrades
One of the defining elements of the Metroid series is the ability and nessessity to collect power-ups which aid exploration.
 Morph Ball Upgrades
In this game, you start with this upgrade.
This upgrade can be found in the first ruins.
 Spider Ball
Pressing down while in Morph Ball mode allows you to use this upgrade. It allows you to crawl on walls and ceilings. Pressing , getting damaged, or being hit by your bombs automatically disables Spider Ball mode.
This upgrade can also be found in the first ruins.
 Spring Ball
This upgrade is in the second ruins.
 Beam Upgrades
You can only have one beam upgrade at a time. Fortunately, all of the beams can be found in the fourth ruins in addition to there normal hiding places.
 Ice Beam
Freezes most enemies on contact. Found in the first ruins.
 Wave Beam
Goes through walls and armored enemies. Travels in a wave pattern. Found in the second ruins.
Fires three parallel beams. Found in the third ruins.
 Plasma Beam
Goes through enemies. Also found in the third ruins.
 Jumping Upgrades
What's a platformer without some form of vertical movement?
 High Jump Boots
Increases the height of your jump. Found in the second ruins.
 Space Jump
Allows you to repeatedly spin jump. Found in the third ruins.
 Screw Attack
Makes the spin jump instantly kill most enemies. Found in the fourth ruins.
 Varia Suit
Halves damage received and, curiously, increases your walking speed. Found in the second ruins.