A 1984 [[InteractiveFiction text-based adventure game]] published by Creator/{{Infocom}} and yet another spinoff of that wholly remarkable franchise ''Franchise/TheHitchhikersGuideToTheGalaxy''. The game was co-written by Creator/DouglasAdams and Creator/SteveMeretzky.

It's notorious for being [[NintendoHard maddeningly difficult]] and very funny, and stays close to the other versions of ''The Hitchhiker's Guide to the Galaxy''.

You can play it online [[http://www.bbc.co.uk/programmes/articles/1g84m0sXpnNCv84GpN2PLZG/the-hitchhikers-guide-to-the-galaxy-game-30th-anniversary-edition here]].

!!This game contains examples of:

* AllThereInTheManual: Not really, but being familiar with the radio show/novels/TV/movie versions can help.
* BagOfHolding: [[spoiler:This is what the thing your aunt gave you that you don't know what it is actually is. One of the most useful things you can do with it is storing all of the tools.]]
* ChekhovsGun: Virtually all objects everywhere. Except the useless ones. Note: which ones are useless changes a bit from game to game. [[NintendoHard You're welcome.]]
* ClingyMacGuffin: The Thing Your Aunt Gave You Which You Don't Know What It Is. But it's a [[BagOfHolding good thing]] you couldn't lose it... even when you're not where you were--or ''who'' you were, for that matter--when you lost it.
* ControllableHelplessness: When you are in "Dark".
* {{Doublethink}}: "Intelligence" is defined as the ability to do this, and the only way to enter Marvin's room is to demonstrate that you have intelligence. Appropriately enough, you ultimately accomplish this by physically removing your common sense, allowing you to carry "tea" and "no tea" at the same time.
--> '''Door:''' Wow. Simultaneous 'tea' and 'no tea'. You are ''clearly'' a heavy-duty philosopher.
* EarlyGameHell: The first parts of the game whirl you through the scenes with very strict time limits to complete your objectives: you're in a DoomedHometown and the clock is ticking. Once you're aboard the Heart of Gold you can relax and take your time experimenting.
* EasterEgg: A couple of the footnotes have nothing referring to them; you'll only read them if you're specifically going through all the footnotes.
* EmptyRoomPsych: "You can't hear anything, see anything, smell anything, feel anything, or taste anything, and do not even know where you are or who you are or how you got there" seems to be the narrator's catchphrase. If you wait long enough, one of the senses will be eliminated from the list, and using it will help you quite a bit (even if it seems useless at first.)
** The Engine Room, at least at first. The reason being that the game is [[NoFourthWall still sulking]] after you insisted on going into the room against its recommendations. [[spoiler:After you pester the game with "look" commands for a bit, it finally relents and lets you see what's in there.]]
** There are a few rooms or areas that have no use whatsoever, except as window-dressing, and don't even need to be passed through on the way to somewhere else (like the walkways around Arthur's home, or the very nice rooms in the flat where the party takes place--except, of course, the room you start in, which is where all the action takes place).
* ExpospeakGag: Some items are given a name that's more complex than the everyday name. Top billing goes to the aspirin tablet in the beginning; it's called a "buffered analgesic." Deducing that you're A) starting the game with a hangover and B) swallowing this might help with that problem is the first of many hurdles.
* FootnoteFever: The footnotes are all accessed by putting in "Footnote 1", "Footnote 2", etc. Because of this you don't have to wait to be prompted with one, you can read them all whenever. After a certain number it starts telling you there is no footnote for that number, and a little past that you get a note saying "Reading all the footnotes is fun, isn't it?"
* {{Foreshadowing}}:
** "As you pick up the toothbrush a tree outside the window collapses. There is no causal relationship between these two events." [[spoiler:After you win the game, it mentions that there ''was'' a causal relationship, and apologizes for the mix-up.]]
** And the first line in response to an inventory check: "You have: no tea..."
* FriendlyEnemy: The game itself was programmed to emulate this mindset.
--> '''Player:''' [[CatchPhrase DON'T PANIC]]
--> '''Game:''' Why not? Your situation appears quite hopeless.
--> '''Player:''' PANIC
--> '''Game:''' Not surprised.
* GayOption: The game recognizes commands to kiss and enjoy characters of either gender... but it just tells you that this isn't ''that'' kind of game. Sorry, slash fans.
-->"This is family entertainment, not a video nasty."
* GuideDangIt: On a couple of levels. For one thing, many of the puzzles have no clues except for the in-game Hitchhiker's Guide, and the articles they're found in are sometimes something no one would think to look up on their own ("[[spoiler:Brownian Motion]]"?). For another, said puzzles are often NintendoHard anyway, and if you mess any of them up, the game will become unwinnable. Then again, reading [[Literature/TheHitchhikersGuideToTheGalaxy the books]] (including the sidenotes) will help with some of the puzzles.
* HaveANiceDeath: One of them goes on for several screens, reacting to whatever you try to type with "You keep out of this, you're dead." Another one reads:
-->"Your serious allergic reaction to protein loss from [[{{Teleportation}} matter transference beams]] becomes a cause celebre among various holistic pressure groups in the Galaxy and leads to a total ban on dematerialisation. Within fifty years, space travel is replaced by a keen interest in old furniture restoration and market gardening. In this new quieter Galaxy, the [[PsychicPowers art of telepathy]] flourishes as never before, creating a new universal harmony which [[MentalFusion brings all life together]], [[EnergyBeing converts all matter into thought]] and brings about the rebirth of the entire Universe on [[AscendToAHigherPlaneOfExistence a higher and better plane of existence]]. However, none of this affects you, because you are dead."
* HubLevel: When you reach the Heart of Gold, you should have the equipment to visit each other location in the game. After completing those locations, you will return to the Heart of Gold.
* InTheFutureWeStillHaveRoombas: They make getting the [[TranslatorMicrobes Babel Fish]] considerably more difficult than it should be.
* LeftHanging: The game ends when you disembark on Magrathea. Plans for a sequel fell through due to many factors.
--> You take a single solitary step onto its ancient surface... and almost immediately [[TakeOurWordForIt something so amazing happens]] that you'll have to buy the next game to learn all about it.
* LogicBomb: Until you are able to acquire a cup of tea, your inventory will always have the item "no tea". But it's not just a cruel reminder of your refreshment deprivation - it ''is'' an object in your inventory. You can't drop it, you can't do anything with it. However, once you fix the drink dispenser on the Heart of Gold, you can acquire "tea", and "no tea" will be dropped. For the reasons listed under {{Doublethink}}, you need to have ''both''.
* TheManyDeathsOfYou: There are an insane number of ways to die, and pretty much all of them garner you [[HaveANiceDeath a snarky message]].
* NiceJobBreakingItHero: When you issue a command the game doesn't recognize, it makes a note of it, then later informs you that when you typed in that command, you inadvertently plunged a far-distant galaxy into a terrible war, which caused the races involved to unite in an intended war of genocide against your home planet.[[note]]A reference to Arthur's saying "I seem to be having tremendous difficulty with my lifestyle" causing a galactic invasion fleet to head to Earth (and be swallowed by a small dog) in the book.[[/note]] Later becomes a BrickJoke (and opens up a few additional ways to die--but also is required to pass a significant puzzle in the game.)
** In the event that the player types things perfectly, [[DevelopersForesight the game will still take a specific phrase in order to advance the plot]]. Potential candidates include "plug plug in plotter", or "put dangly bit in tea".
* NintendoHard: Oh, so very much. This game has been known to cause grown men to cry at the mere mention of the phrase "[[TranslatorMicrobes Babel Fish]]".
* OneTimeDungeon: Once you complete the sublocations, revisiting them generally causes an insta-kill that sends you back to the Heart of Gold. Unfortunately, there's one that causes a YouAreAlreadyDead situation for ''you'' if you've completed it.
* PornStash: There's nothing useful under the bed, but there is something that can't be described in a family-friendly game.
* PressStartToGameOver: If you fail to get out of your house in about twenty moves, you die. Thus setting the tone for the other 99 percent of the game.
* PressXToDie:
** It is not a good idea to type "escape" when you are imprisoned, strapped down or lost in the dark. It works!... fatally.
** Typing "kill self" and the like does exactly that, with the game itself saying nothing more than a "Done." about it.
* RealityBreakingParadox: [[spoiler:If you end up inside your own head again after you have removed your common sense, you'll [[YourHeadAsplode kill yourself]] because ''this'' time you're normal-sized. It takes a few turns for the death to catch up to you as the player.]]
* RubeGoldbergHatesYourGuts: The Babel Fish puzzle.
* SolveTheSoupCans: Oh, dear lord.
* SupportingProtagonist: It can be helpful to ask the game at certain points, "Who am I?" Because the answer is likely to change without notice.
* TemporalParadox: You'll revisit the same events from the viewpoint of different characters, alter the past through things you haven't done yet, and just generally give causality a good pantsing.
* UnexpectedlyRealisticGameplay: Giant parts of the game. You have a headache? Take an aspirin. After taking it out of your dressing gown pocket. After opening the pocket. After putting the dressing gown on. After turning on the light. After getting up out of bed. Oh, and realizing that the [[SesquipedalianLoquaciousness "buffered analgesic"]] ''is'' aspirin.
* UnreliableNarrator: As if the game wasn't hard enough already, the narrator will sometimes ''lie outright'' about what's going on.
--> '''Game:''' You are in the engine room for the Infinite Improbability Drive. [[SuspiciouslySpecificDenial It is uninteresting. There is nothing to see here]].\\
'''Player:''' LOOK\\
'''Game:''' I'm serious! There's nothing to see here!\\
'''Player''' ''(since this room is what one might call 'crucial' to what one might call 'winning'):'' LOOK\\
'''Game:''' Okay, okay. There are ''a few'' things to see here.
* UnwinnableByDesign: The player can render the game unwinnable easily and without warning. For instance, there are two entirely separate ways in which it is possible to get all the way to the end of the game and then learn that the game is now unwinnable because of something you didn't do right at the start.
## One thing you need to do at the start, but probably won't think of if somebody doesn't warn you, is giving a dog a sandwich. Yes, ''giving a dog a sandwich''. [[spoiler: Apparently you can also have Ford do it when you revisit that event later, at least indirectly; if you buy a cheese sandwich as Ford and then give it to Arthur, he'll toss it to the dog as he runs back to his home.]]
## There are about a dozen tools hidden throughout the game, and Marvin will need one of these tools to help you. ''Two'' of these tools are in your soon-to-be-demolished house at the beginning (don't worry; if you take every item you see in the house before leaving[[note]]Immediately after taking the medicine, type GET ALL[[/note]], you'll have both). You can only bring one tool to the necessary location because of the tight space, and the game will randomly pick the one you don't have. Even if you use the plant to pre-determine which tool is necessary, the game will still prioritize inaccessible tools.
** Then there's also the part with [[WombLevel the whale]] [[ThatOneLevel scene]]. You need to get the flowerpot and get out of the stage quickly. Although you may be tempted to wait until you get splattered against the surface of Magrathea, you should '''NEVER''' do so, since getting splattered and then returning to the Heart of Gold means that you lose all your items that weren't worn or stored in the BagOfHolding; and that means you could lose most of the tools or fluff or flowerpot, rendering the game totally unwinnable. The solution? [[spoiler:Press the BigRedButton on the remote device to summon a robot, show it the device's guarantee, then press the green "hitchhike" button to return to the dark with all of your items intact. Backup solution is to put everything you have in the Thing and wait it out.]]
** If you successfully complete the task in Arthur's own brain[[note]]removing Arthur's common sense[[/note]], then end up inside it again via a Dark sequence, you end up [[spoiler:killing yourself by materializing inside at ''normal size'']]. Since the Dark sequences are at least somewhat randomized and not changeable when using the Advanced Tea Substitute, this can be rather annoying. Funnily enough, one of the ways to avoid doing so is to do one of the actions above that would normally render the game unwinnable in another way, then undoing it. [[spoiler:Fail to give the dog a sandwich as Arthur initially, then after you get the tea and hook it up to the atomic vector plotter, give a cheese sandwich to Arthur as Ford during his sequence.]] Some potentially Unwinnable sequences can only be accessed after [[spoiler:getting the tea]], which allows some control over which situation you end up in, but not this one.