Comp 372 Program 5	- Dordal - Due Dec 10 (or later)

You are to extend the CLOS version of the game program described in class 
in the following ways. All new verbs should be at least recognized
in every room. All new puzzles should at least be plausible. Note that
CLOS does not require you to define a new class to create a special room;
you can simply provide room-specific versions of defmethod.

1. Add a second lantern or other Lightable. It may have either the same
pname ("LANTERN") or a new pname (TORCH/FLASHLIGHT). 

2. Introduce a puzzle room where you cannot *leave* the room until some
action occurs. Possibilities are:
    You have to FIGHT the dragon (with a SWORD?)
    You have to GIVE the dragon a PRESENT or COOKIE.
    There is a cave-in and you have to DIG (with SHOVEL?)

Optional extension: You cannot leave a SET of rooms until you complete
the FIGHT/GIFT/whatever.

3. Implement the STONEROOM scenario following:
	You have entered a large room in the cave
	A heavy stone lies on the middle of the floor
	It looks like it would be difficult, but not impossible, to move it.
	 > inventory
	You have the following things:
	    cookie
	 > move stone
	you are too weak and hungry to move the stone.
	 > eat cookie
	boy! that made you feel stronger!
	 > move stone
	infused with a sudden rush of extraordinary strength,
	you are able to move the stone easily.
	A moneybag is revealed.
	 > inventory
	You don't have anything.
	 > take moneybag
	You have picked up the moneybag

In the version above, EAT COOKIE makes the cookie go away.
The penalty for not having the cookie go away is negligible.

You will have to have a STONEROOM-specific version of INTERPRET for MOVE.
Also TAKE, because you don't want people to be able to TAKE MONEYBAG 
until after the stone is moved. (Alternatively, you can have MOVE STONE
*create* the moneybag in the room at that point.)

You probably should create a class EATABLE derived from CARRYABLE, to 
represent foods (though this isn't absolutely necessary). 

Optional: the cookie should last 2-3 bites. Keep the number of bites left
as an attribute of the EATABLE class itself. 

You can substitute another food item (eg CHOCOLATE) if you wish.


4. You are to add one additional puzzle of your own. Your puzzle should,
at a minimum, involve the following:
	one new CARRYABLE 
	one new verb 
	one new derived room class, with special behavior for 
		at least one verb (new or existing).
	some kind of state change to the room or to an object
	 	(like the stone being moved or valve being turned)

Here are a few possibilities.

UNLOCK CHEST with a KEY found elsewhere; once the chest is unlocked,
something should be inside.

Cross a rickety two-move bridge over a bottomless pit; if you carry too
much the bridge will break; you can only carry two things at a time.

Have goblins attack you in a pitch-black cave room, if you fail to
LIGHT LANTERN within 2 turns. Note that this puzzle involves keeping
count of turns.

You need to CAST SPELL in the WizardsChamber, but in order to do this
you must first find in the game a BELL, BOOK, and CANDLE. (And maybe
LIGHT CANDLE? Or maybe, in the simpler direction, just find NEWTEYE 
and BATWING. If you try to CAST SPELL and don't have the ingredients,
the game should tell you what you're missing.)