Ladder

Ladders are found on Biologic Space Laboratories research station. In Metroid Fusion, ladders are always bars protruding from a surface. They can be climbed as well as jumped and fired from on both walls and ceilings.

LADDERS
"Samus can grab on to ladders by facing and jumping toward them."

Trivia

 * Samus is also able to climb ladders in Super Smash Bros. Brawl.