These keys are used to open locked doors in Rubber Prison.
How to Acquire
There are four Prison Keys in Rubber prison.
- On the first level, in the room with thorns in a cage before the main foyer.
- On the first level, in the prison cell area, in the upper right cell.
- On the first level's bridge, held by a Wasp Driller.
- On the second level, on the left side of the gym after a platforming puzzle.