BUG
                                     1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2
         VERSION   1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8
         2/AS000C  Y Y Y Y Y Y Y Y Y Y N N Y Y Y Y N Y N Y Y Y N Y N N Y Y
         5/        N N Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y N Y Y Y
        15/UG3AU5  N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y Y Y Y N Y Y Y
        20/        N N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y Y Y N Y Y Y
        23/820428  N N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y Y Y N Y Y Y
        25/820515  N N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y Y Y N Y Y Y
        26/820803  N N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y Y Y N Y Y Y
        28/821013  N N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y Y Y N Y Y Y
        30/830330  N N N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y Y N Y Y Y
        75/830929  N N N N N N N N N N N N N N N N N N N Y Y Y Y Y Y Y Y Y
        76/840509  N N N N N N N N N N N N N N N N N N N Y N Y Y Y Y Y Y Y
       *88/840726  N N N N N N N N N N N N N N N N N N N N N Y Y Y Y Y Y Y
   (SG) 52/871125  N N N N N N N N N N N N N N N N N N N N N N N N N Y Y Y

             Mini-Zork 1                                
        34/871124  N N N N N N N N N N N N N N N N N N N N N Y N N Y Y N N

          1. Many commands which produce strange output in later versions, give no response at all in Version 2, and the game simply goes on to the next turn. For example, the commands READ MAILBOX, and EAT ME give no response at all in Version 2, but in the next version (Version 5), you get "How can I read a mailbox?" and "I don't think that the you would agree with you." -- Alan Franzman

          2. THE SLIDE BUG: In Version 2, when you drop items down the slide, the game first tells you that it's done, then tells you it can't be done, and then removes the item from the game entirely. For example: EXAMINE ""

>DROP TRIDENT IN SLIDE
"The crystal trident falls through the slide and is gone."
"I can't do that."

          3. The earliest releases of Zork I (Versions 2 and 5) can become very confused if you nest objects too deeply in your inventory, such as putting the lunch in the sack, then the sack in the coffin. You may get very spurious output from the INVENTORY command like "Such language in a high-class establishment like this!" messages, with other random junk interspersed in it. This can also lead to the object hierarchy getting screwed up, in such a way that an INVENTORY might claim that you are carrying a bunch of rooms around!
         ADDITIONAL: Technically this bug is present in all versions of the game. In Versions 2 and 5 it occurs when three objects are nested (i.e. canary in egg in sack). In later versions it only occurs when 7 objects are nested, which is difficult but not impossible to create. Take the canary, egg, sack, buoy, coffin, and (inflated) boat to the Shaft Room, and issue the following commands: PUT EGG IN SACK. PUT CANARY IN EGG. PUT SACK IN BUOY. PUT BUOY IN COFFIN. PUT BOAT IN BASKET. PUT COFFIN IN BOAT. LOOK. (As everything can't be carried simultaneously, some TAKE and DROP commands may need to be interspersed here.) When you LOOK, a random phrase from somewhere else in the game may be mixed with the output. In the Solid Gold version, the phrase "up to your ankles" (from when the water is rising in the Maintenance Room) will be before the description of the canary. In other versions there are different effects, some random phrases, and some gibberish. -- Michael the Great

          4. In Versions 2 and 5, commands such as GO DOOR or GO TREE can send players into random locations. -- New Zork Times

          5. In Version 5, the command HIT MIRROR WITH SWORD will generate combat responses, such as "The mirror parries", or "The mirror dies in a cloud of sinister black fog." In Version 2, you miss the mirror and the game crashes with a Stack Overflow error. -- Graeme Cree

          6. In Versions 2 and 5, the command GIVE AXE TO TROLL will generate a response like:

"The troll accepts your gift, and not having the most discriminating taste, eats it.
The troll, dismarmed, is cowering and begging for forgiveness in the gutteral language of the trolls."

(In Version 2, he "gleefully" eats it. Picky, picky.) Though the troll can no longer attack you, he still blocks the exits and parries, while continuing to beg for forgiveness. -- Graeme Cree

          7. In Versions 2 and 5, if you give the troll to himself, he eats himself and disappears. He still bars you from leaving the room though, only now he can't be attacked. -- Graeme Cree
          NOTE: In fact, as Ethan Dicks has pointed out, virtually anything can be given to the troll (or thief) in this version: your hands, your eyes, the eastern wall, a compass direction, even "ME". The troll will then eat them and you will be unable to interact with them for the rest of the game (although you can still go "east" if you give "east" to the troll). The thief of course will leave them lying around instead of eating them.

          8. In Versions 2 and 5, if you give the troll to the thief, the thief puts the troll in his bag, but the troll still blocks the exits. If the thief is killed, the troll reappears. -- Graeme Cree

          9. In all versions after Version 5, if you try to use a compass direction while in the boat, the game will (reasonably) tell you that you can't go that way in a magic boat. In Versions 2 and 5, it will tell you that you can't go that way in a tan label. -- Graeme Cree

          10. In all versions after Version 5, when you reach the portion of the river where the buoy is, the description will tell you that the buoy is "(outside the magic boat)". Versions 2 and 5, tells you that the buoy is "(in the room)"! -- Graeme Cree

          11. If you try to GET OUT OF THE BOAT while floating down the river, all versions of the game tell you that you realize "just in time" that such a course would be suicidal. In all versions before and after Version 5, the game prevents you from leaving the boat. In Version 5, it lets you leave and kills you, despite having told you that you had realized not to do it. -- Graeme Cree

          12. THE FLOODGATES BUG: In version 5, if the nest is not taken at location Up a Tree, the room description eventually changes to a torrential flood of output, several screens long, containing a mishmash of fragments of room, noun, and action descriptions that you see whenever you enter the room (except in superbrief mode), or do a LOOK.
          It isn't clear precisely what causes it, but it happens every time if you go down into the GUE, through the maze, grab the bag, come out through the Cyclops Room into the Living Room, and outside to the tree. It might be triggered by a certain point level, or something else.
          If you try to TAKE the nest after the bug has triggered, the game will lock up. Taking the egg before or after has no effect. -- Graeme Cree

          13. In Versions 2, 5 and 15, shaking an open container that isn't empty may crash the game. This works with the sack, but not the bottle. -- New Zork Times

          14. In Versions 2, 5, 15, 23, 25, 26, and 28, you can bump your head on things such as the river by trying to ENTER them. -- New Zork Times

          15. THE WIMPY PHANTOM THIEF BUG:  You know, that thief is really tough in combat. Why not fight his phantom instead? He doesn't fight back.
          In Versions 2, 5, 15, 23, 25, 26, 38, and 30, engage the thief in combat (outside of his lair). Wait until he robs you and leaves; you will see this message:

The other occupant just left, still carrying his large bag. You may not have noticed that he robbed you blind first.

          16. In Versions 2, 5, 15, 23, 25, 26, 28, and 30, you can take the torch into the Gas Room without setting off an explosion, provided that it is inside the Raft or the Coffin (open or closed). -- Allen Garvin

          17. In versions 5, 15, 23, 25, 26, 28, and 30, the single-line description of the torch and candles stays unchanged after they have been removed from their initial locations.
          For example, put the torch into the gold coffin, close it, then open it again. You will see:

>OPEN COFFIN
The gold coffin opens.
Sitting on the pedestal is a flaming torch, made of ivory.

>OPEN COFFIN
The gold coffin opens.
On the two ends of the altar are burning candles.

>OPEN COFFIN
Opening the gold coffin reveals a torch.

>OPEN COFFIN
Opening the gold coffin reveals a pair of candles.

         This doesn't seem to work in Version 2, if only because in that one, the coffin is so much smaller, and can't contain either the torch or candles. -- Graeme Cree

          18. In Versions 2, 5, 15, 20, 23, 25, 26, 28, and 30 you can take the boat while already in it.
          DROP the (inflated) boat in the living room. Then GET IN BOAT, PUT BOAT IN CASE, and then GET ALL FROM CASE. The game will respond:

magic boat: Taken.
nail: It's not in that!

          19. THE PICKUP BUG:  In games like Planetfall and Enchanter, people have reported situations where one could exceed their normal weight limits, and carry something that they could not pick up themself, simply by having someone hand it to them. I have never regarded these as bugs, reasoning that if you're holding an armload of equipment it's easier to take something that someone gives you than bending over and picking it up.
          I can't defend this bug, though. In all versions up to Version 30 (except perhaps Version 2 again, where the containers are so much smaller), you can pick up items that you normally couldn't, simply by putting them into something else that you're already carrying.
          For example, try this: 1) Put the bell and axe (nothing else) into the gold coffin, and leave it open. 2) Have only the lunch, garlic and coffin (loaded with bell and axe) in your inventory, with the empty sack at your feet. If you then try to PICK UP SACK you will be told "Your load is too heavy.", but if you PUT SACK IN COFFIN it works, and you're told "Done."
          You can signifigantly exceed your weight limits this way if you pick up items by putting them in the coffin and then take them out of the coffin to make room for new items, but there are limits. Eventually things will start slipping from your fingers and falling to the ground when you try to take them out of the coffin.
          In versions 75 and later, you cannot put something into something else unless you already have it in your inventory when you issue the command. --Fredrik Ekman

          20. THE PHANTOM BOAT:  In Versions 2, 5, 15, 20, 23, 25, 26, 28, 30, 75 and 76, you may continue to occupy the boat after you've destroyed it.
          Inflate the boat, and drop it. GET IN BOAT, then CUT BOAT WITH SWORD. The game will reply: "Your skillful swordsmanship slices the magic boat into innumerable slivers which evaporate instantaneously."
          However, you will still be considered to be in the boat for all locational purposes, save that you will not be able to refer to it. If you were in the water when you destroyed the boat, you will still be afloat. Unfortunately, in most versions you will not be able to get out of the boat, (such as by saying DISEMBARK BOAT) not being able to refer to it, nor will you be able to give it directional commands (if you are in the river), which means that you are trapped, and the game is unwinnable.
          In versions 75 and 76, you will at least be able to escape the phantom boat by typing STAND, a command that exits the boat without directly referring to it. Earlier versions do not know this word.
          The same thing will happen if, instead of destroying the boat, you give it to the thief while inside it, and he leaves with it. -- Allen Garvin

          21. If you knock the thief unconscious and try to take his stiletto, the game says that it is "white hot," and that you drop it -- obviously some sort of protective magic. However, in Versions 2, 5, 15, 23, 25, 26, 28, 30, and 75, if you try to PUT STILETTO IN SACK (for example) it will let you, but when the thief wakes up, he continues to attack you with the stiletto, even if you have moved it to a different room! In later versions, it refuses to let you put it in the sack at all, saying that you don't have the stiletto. -- B.J. Parker

          22. BIRTHDAY CANDLES BUG:  In all versions except the Solid Gold (and Mini-Zork), Zork 1 apparently uses trick relighting candles.
          The first time you go to the Temple, type BLOW OUT CANDLES, *without* taking them, then type LOOK. The description will say "On the two ends of the altar are burning candles.", but if you examine them, it will say that they are out. If you try to light them, you will be told "The candles are lit," instead of "already lit" which is what it says when they are burning. If you do an INVENTORY command, the candles will not say "(providing light)".
          However, the room description is correct, and all of the other indicators are wrong. The candles *are* still lit and will quickly become too small to use unless you put them out for real, by taking them and either dropping them, or lighting and blowing them out again.
          The only reliable way to blow out the candles is to hold them while you do it. This bug drove me, well, buggy, until I tracked it down, trying to figure out why my candles were being destroyed even though I knew I had blown them out. -- Graeme Cree

          23. Here's a variation on the Starcross disk bug. If the sack and the bottle are both empty, it's possible to put the sack in the bottle, then put the bottle in the sack, causing both to vanish. This exists in all versions except the Solid Gold, Mini-Zork, and Version 2 (because the bottle is too small to hold the sack in that one). -- New Zork Times

          24. BOTTLE BUG: In all versions except the Solid Gold and MiniZork, you can POUR WATER regardless of whether the bottle is open or closed. -- Graeme Cree

          25. TRAPDOOR BUG:  In versions 75, 76 and 88, there is a way to open the trapdoor from the inside. At the beginning of the game, enter the following commands:  N. E. OPEN WINDOW. W. W. TAKE LAMP. MOVE RUG. LIGHT. OPEN TRAPDOOR. D. N. G.
          When you enter the G (or AGAIN) command, you will be told "The trap door opens." You can then return to the Living Room, and the trapdoor will not be barred behind you when you descend to the Cellar later.
          The order of the commands matters. If you reverse the order of LIGHT, and OPEN TRAPDOOR, then you will be told "It is already on" when you type AGAIN. For some reason the AGAIN command thinks you are referring to the lamp.
          It isn't clear if this is a bug or a playtesting device that Infocom forgot to remove. -- Allen Garvin
          NOTE:  Matthew Russotto suggests that this bug is a combination of another bug wherein AGAIN did not check to see if the object referred to was still present, and a deliberate change that made AGAIN ignore directional commands. The Phantom Thief Bug was another manifestation of this, but that bug was patched separately, rather than fixing the underlying problem. Therefore, AGAIN in this case refers to your opening of the trapdoor three moves ago, because all commands in between have been directional.
          He points out that similar tricks can be used to disarm the troll, and to attack him when he is not present (a la, the Phantom Thief Bug).
          From the Troll Room, the commands TAKE AXE, S, AGAIN, will let you take the axe while you are in the cellar, even though it will be invisible to LOOK and INVENTORY commands.
          Also from the Troll Room, the commands, ATTACK TROLL WITH SWORD, S, AGAIN, gives you the Phantom Troll Effect (similar to the Phantom Thief), allowing you to attack the Troll while he isn't present, and can't fight back.

          26. Another container bug, but this one is in all versions, even the Solid Gold edition (Except for Version 2 with its notoriously small containers again). If you put the (inflated) raft in the coffin, then the coffin in the raft, both will disappear. This does not work the other way around, however. If you put the coffin in the raft first, then the raft in the coffin, you get a message saying that there is no room. In Mini-Zork, this bug not only appears, but the game locks up to boot (no pun intended). -- Graeme Cree

          27. THE RAFT OF HOLDING:  When you put objects in the raft and then deflate it, they effectively cease to exist, allowing you to carry as much weight and as many objects as the raft will hold (it won't hold the gold coffin, unfortunately, and of course sharp objects are out). This is because the game handles the pile of plastic and the raft as two separate objects, and there's no provision for handling any objects inside the raft when the switch is made. -- Stu Galley in The New Zork Times

          28. TEETH OVERBOARD:  All versions of the game (except Mini-Zork) have an odd problem synonyming the word overboard (which really shouldn't be a noun at all, should it?). In versions 2-28, overboard is a synonym for object 212, in version 30 object189, and in versions 75 onward as teeth (!), as can be seen by typing EXAMINE OVERBOARD on the first turn of the game. -- Gunther Schmidl

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