"What is this thing?"
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Grapple refers to multiple subjects in the Metroid series. You may be looking for:
Grapple Beam, a beam with tethering properties
Grapple Point, an object that can be tethered by the Grapple Beam
Grapple Crossing, a room in Norfair
Grab, the Grapple Beam as a move in Super Smash Bros.
Grapple Guardian, a darkling Grenchler with the Grapple Beam
Grapple Lasso, an upgrade that pulls away obstacles
Grapple Voltage, an upgrade that drains or gives energy
Hyper Grapple, a Hypermode attack using the Grapple Beam
Ship Grapple Beam, a Grapple Beam used by the Gunship
Ship Grapple Point, an object that can be tethered with the Ship Grapple Beam
Hyper Grapple blocker, an organic mass that can be overloaded with the Hyper Grapple
Grapple Voltage Door, an unused door that appears on the Map Key of Metroid Prime 3: Corruption
Red grapple point, an object that can be pulled with the Grapple Beam