Secret Doors by Andrew Owen

Secret Doors is an extension which provides robust support for hidden doors and hidden switches. It creates two new kinds: "secret door" (a kind of door) and "secret switch" (a kind of thing) with the properties "revealed" or "unrevealed".

The passage door is a secret door.
The passage door is west of the Big Cave and east of the Secret Passage.

The hidden lever is a secret switch in the Big Cave.

If the player attempts to walk through a secret door, the same response to attempting to travel in a non-existent direction is given:

>west
You can't go that way.

If the player attempts to interact with a secret switch, the same response to attempting to interact with a non-existent object is given:

>pull lever
You can't see any such thing!

>throw rock at lever
You can't see any such thing!

It might be that we want the switch to be in plain sight. In that case it should be defined as a normal object rather than a secret switch:

The lever is fixed in place in the Big Cave.

Instead of pulling the lever for the first time:
     now the passage door is revealed;
     now the passage door is open;
     say "As you pull the lever, a secret door opens, revealing a secret passage!"

If on the other hand we want the switch to be hidden as well, then we need a way of revealing it so that it can be used. For example:

The lever is a secret switch in the Big Cave.

The cave wall is scenery in the Big Cave.

Instead of searching or examining the cave wall:
     now the lever is revealed;
     say "In a gap between two rocks you discover a lever."

Instead of pulling the revealed lever for the first time:
     now the passage door is revealed;
     now the passage door is open;
     say "As you pull the lever, a secret door opens, revealing a secret passage!"

Section: 6M62 Compatibility Update

This extension differs from the author's original version: it has been modified for compatibility with version 6M62 of Inform. The latest version of this extension can be found at <https://github.com/i7/extensions>.

This extension is released under the Creative Commons Attribution licence. Bug reports, feature requests or questions should be made at <https://github.com/i7/extensions/issues>.