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Boost Ball
The Boost Ball is an upgrade for the Morph Ball that has appeared in the Prime series. It allows Samus to, when in the form, to have an extra boost in speed, similar to the Speed Boost. The more Samus charges the boost, the faster she will go, relative to the Charge Beam.
Metroid Prime
The Boost Ball first appeared in Metroid Prime. It is found in Phendrana Canyon of Phendrana Drifts. It allows Samus to boost up half pipes and activate Spinner devices. It is needed to aquire the Space Jump Boots and the Ice Beam.
Metroid Prime 2: Echoes
The Boost Ball remains the same in Metroid Prime 2: Echoes with the addition that it can allow Samus to jump perpendicular to the [[Spider Ball] Track that she is on. It is obtained after defeating the Boost Guardian in Dark Torvus Bog.
Metroid Prime 3: Corruption
The Boost Ball is upgraded in Metroid Prime 3: Corruption in which it can damage enemies on contact, much like the Death Ball. It is aquired after defeating the Defense Drone in Skytown. It is required to free Aurora Unit 217 and defeat Ghor.
Spinner Devices
The Boost Ball can operate Spinner Devices. Samus can enter Morph Ball Mode and enter the device, charge up her Boost Ball, and activate it rapidly to allow the device to open up a walkway, open a door, flip a switch, or as shown in Corruption, use static electricity to power up a conduit.
