Using an extension

gistfile1.ni

"Lost Key 3" by Rob

Include Hidden Items by Krister Fundin.

The Prison is a room. "Dirty, smelly, and cold -- everything that you hate in a room."

There is a key. The description is "This must be the key for the door." The key is hidden in the Prison.

A pile of dirt is here. It is scenery.

 Instead of examining the pile of dirt for the first time:
    reveal the key;
    say "You dig through the dirt and there at the bottom is something remarkable -- the key.";