The key is kept within an elaborate lockbox,
with wires leading to five sliding picture puzzles which must be solved in the correct order!
But you can't move the panels from inside your cell, right?
Ah, but there's a trick to it!
Inside the cell there are five sets of sliding tiles locked in their frames in the floor!
You can remotely control those sliding picture puzzles using the tiles you have access to!
If you successfully solve the puzzle, the key will be delivered to your cell by a zipline!
Rather ingenious design, don't you think? Aren't you excited to try solving it?