"What is this thing?"
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Pit may refer to a number of subjects and rooms in the Metroid series. You may be looking for:
Rooms[]
Pit Tunnel
Triclops Pit
Judgment Pit
Feeding Pit Access
Feeding Pit
Phazon Pit
Croc's pit
Other[]
Pit Block
Pit, a character in the Super Smash Bros. series