"What is this thing?"
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Bridges are recurring environmental elements within the Metroid series, often serving as methods of crossing large chasms. You may be looking for:
"N00b bridge"
Mk II Bridge/GF Bridge
Damaged Bridge
Forgotten Bridge
Flag Bridge/Command Bridge
Ice Bridge
Control Bridge
Machineworks Bridge
Great Bridge
Sacred Bridge
Mk III Bridge
Dark Forgotten Bridge
Flag Bridge Access
Cyrlic trees, that are sometimes found intertwined into bridges
Great Trees, also sometimes found as bridges
"Bioweapon Research Center access bridge"