Which upgrade allows Samus to run faster?

The upgrade that allows Samus to run faster is the Speed Booster. In Super Metroid, this power-up dramatically increases her running speed and lets her smash through special Speed Booster blocks and many enemies without stopping.

The Speed Booster also introduces one of Samus’s most recognizable techniques: the Shinespark. After building up speed, she can crouch to store the charge and then launch herself in a chosen direction. This turns a simple movement upgrade into a tool for reaching hidden rooms and solving traversal puzzles.

Super Metroid was the Speed Booster’s debut appearance in 1994. It later returned in Metroid Fusion, Metroid: Zero Mission, Other M, and Metroid Dread, although its controls and movement rules changed between games. A common mix-up is confusing it with the Hi-Jump Boots, which increase jumping height rather than running speed.