The Boost Ball upgrade works with the Morph Ball ability. The player can charge up power within the suit to propel the ball at fast speeds. This can be used to damage enemies, quickly zip past obstacles and through the game, and clear puzzles. Specifically, it is designed for half-pipe structures present within the games. The Boost Ball upgrade is present within the games Metroid Prime: Hunters, Metroid Prime, Metroid Prime 2: Echoes and Metroid Prime 3: Corruption.
 How to Obtain
 Metroid Prime: Hunters
Samus starts off with the ability in this game.
 Metroid Prime
The upgrade can be found in Phendrana Canyon at Phendrana Drifts. To acquire it, the player must scan a panel that controls the floating platforms. You can then use them to transverse the canyon to a cave where you can find the Boost Ball upgrade.
 Metroid Prime 2: Echoes
 Metroid Prime 3: Corruption
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