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Half-pipe
Half Pipes are structures found throughout the Metroid Prime series. They are U-shaped and vary in height. Samus can use the Boost Ball on these Half Pipes to climb up the walls of them. Half Pipes are the product of various different things. For example, the large Half Pipe structure in Phendrana Canyon is a product of ice frozen in a smooth pattern while the Half Pipe in Command Courtyard was created by a Space Pirate mining drill.
Half Pipe structures work with the Boost Ball much like Wall Jump Surfaces with the Skrew Attack or Spider Ball Tracks with the Spider Ball; Half Pipes are only useful once Samus has obtained the Boost Ball. To use them, Samus must boost back and forth in her Morph Ball, she uses gravity in conjunction with kinetic energy used by the Boost Ball to gain momentum and reach higher places. Expansions are often placed near or above these surfaces.
