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->''"He has figured out Monsieur Adell's greatest weakness: His inability to think."''
-->-- '''Tink''', ''VideoGame/Disgaea2CursedMemories''

This refers to any barrier that requires the heroes to solve some kind of puzzle, {{Riddle|MeThis}} or test of skill in order to pass. It is often given by ThresholdGuardians (especially if the guardian in question is a RiddlingSphinx). You must be able to work it out based on the clues you are given on the spot.

It's often a defense against smart people who want to take whatever is being guarded like a TreasureRoom. It can also be a SecretHandshake of sorts to only allow smart people inside like UsefulNotes/{{Mensa}}.

If you must come to it with some knowledge, it's OnlyTheKnowledgableMayPass. Sometimes if those who tried to deploy that trope were clumsy, they gave you enough clues to make it this, and conversely, if the answer to this is too weird or insane, you may really need to know it in advance.

The architect must have deemed this a better barrier than say, a lock and key carried on someone's person instead of [[LockAndKeyPuzzle being in a chest elsewhere in the building]]. After all, keys can be stolen but knowledge is intangible. Unfortunately, this will not stop people who are [[BrainsEvilBrawnGood evil in addition to smart ]] or at least smart enough to [[MacGuffinDeliveryService trick the heroes into solving the puzzle for them]].

See BlockPuzzle, the various {{Stock Puzzle}}s and {{Stock Videogame Puzzle}}s, and SolveTheSoupCans for examples of this.
Expect even the [[BookDumb least smart of protagonists]] to be able to find a way to solve what was [[InformedAbility supposed to be]] an ingenious puzzle.

This trope dates back to at least the Sphinx in Greek mythology, making it OlderThanFeudalism.

Compare OnlyTheWorthyMayPass, TheseQuestionsThree; also see FirstContactMath, and contrast OnlyIdiotsMayPass.
----
!!Examples

[[foldercontrol]]

[[folder:Anime & Manga]]
* The lower levels of Mahora Academy's Library Island in ''Manga/MahouSenseiNegima'' is filled with these, as Negi and the [[CastHerd Baka Rangers]] found out the hard way in an early chapter. However, these were deliberately placed by the headmaster, who appears to have [[SeriousBusiness plotted the whole adventure to force the Baka Rangers to study for their finals.]] The characters treat it more like AlphabetSoupCans.
* ''Anime/OjamajoDoremi'' has Doremi answer a somewhat-Sphinx inspired riddle. [[spoiler: "Thin in the day, thick in the night, it disappears when it sleeps." Answer: Cat's eyes.]]
* ''Manga/ZatchBell''
** The show spoofs this with Poosophagus (Unko Tin Tin). He guards Faudo's esophagus and threatens to drop the whole party in stomach acid if they don't all get a question right. Fortunately, most of his questions are really easy, when he remembers to ask one at all. He only asks two hard ones:
** 829,735 × 962,527 = ?. Posed to Kiyomaro, [[BadassBookworm a supergenius]] who calculates the answer in his head. ("It's [[WritersCannotDoMath 797,812,605,345]]!").
** Prove UsefulNotes/FermatsLastTheorem. A question that would be impossible for almost anyone on the planet, this was posed to Umagon, [[TheUnintelligible who can't even speak]]. Kiyomaro forces Poosophagus to give Umagon an easier question, a more conventional riddle. Mainly, because Poosophagus didn't know the answer himself.
* Subverted in ''Anime/PrincessTutu''. After a mysterious spirit kidnaps Mytho, Ahiru races to find him--and is asked riddles along the way. Ahiru, being an IdiotHero, gets them all wrong, but it turns out that the voice wasn't testing her, but telling her who it was--[[spoiler:a lamp]].
* Subverted in ''Manga/AzumangaDaioh'' when Tomo is asking complicated puzzles requiring lateral thinking. Class genius Chiyo is stumped by them, but class space cadet Osaka answers them all without any hesitation.
* In a completely justified example, the entrance exam in ''Manga/TanteiGakuenQ'' (''Detective Academy Q'') is filled with this sort of thing.
* One of the Hunter Exam trials in ''Manga/HunterXHunter'' asks you who you'd choose to save, your mother or your lover. When Gon notices the first guy (who chose the mother) was sent to his death, he realizes no answer is right, and says nothing. Again, ''no answer'' is right. They pass.
* In ''Anime/SummerWars'', Kenji solves a 2056 Bit encryption not only on paper but in his head in under a minute bypass lock-outs and other barriers put in his path by Love Machine.
[[/folder]]

[[folder:Comic Strips]]
* In ''ComicStrip/PricklyCity'', Carmen is assured only the smartest people are allowed in an exclusive club.
[[/folder]]

[[folder:Films -- Live-Action]]
* The tunnel leading to One-Eyed Willy's ship in ''Film/TheGoonies'' is filled with many booby-traps, such as the most memorable musical riddle. It makes sense since, during Willy's time, only people with a noble/high-born education would be able to read ''sheet music'. Even most musicians would only know how to play instruments, not read standardized notation.
* ''Film/IndianaJonesAndTheLastCrusade''
** The Knights of the Grail have protected their treasure with a series of tests, each more fiendish than the last, to ensure that no unworthy man may pass. The tests are multi-layered: to prove worthy, one must find the clues to the tests elsewhere, interpret them correctly, and successfully act on the interpretation. Without the clues (which Indy's father found in his decades of research into Grail lore) it would be considerably harder if not effectively impossible to figure out the traps before they killed you.\\\
ThoseWackyNazis try to beat it with TrialAndErrorGameplay -- given that [[StupidJetpackHitler Nazis are stupid]], they've already lost ''over a dozen people'' '''to the first trap''' by the time Indy shows up. "Get another volunteer." The final test, is simply of picking out the real Grail among all the dozens of fakes. No physical trait would give any advantage in figuring that out. [[spoiler:Though asking yourself "which cup looks completely unlike all the rest?" would be a good way to figure out that it's the simple wooden cup, even if you knew nothing about the life of Jesus.]]
** Even Indy has a brief bout of IdiotBall and almost falls victim to the second trap. He realizes how it works - you step on the letters on the tiles on the floor to spell out "Jehovah" - but doesn't realize at first that in the original Latin the name starts with an "I". After nearly falling to his doom, he gets it right.
* In ''Film/{{Labyrinth}}'', Sarah solves a classic KnightsAndKnaves puzzle. She can only ask a single question to one of two characters, one of whom always lies and the other tells the truth. She asks one what the other would say and gets a reliably false answer.
* The sphinx guarding Giants Orbiting in ''Film/MirrorMask'' refuses to let Helena and Valentine through without answering riddles. However, as this ''is'' by Creator/NeilGaiman, Helena's answer to the "4 legs in the morning, 2 legs in the afternoon, 3 in the evening" riddle was one of the performing dogs at her parents' circus, who walked around on his back legs as part of the afternoon show and hurt his paw partway through. Her counter-riddle was, "What's green, hangs on the wall, and whistles?" Answer: [[spoiler:A herring]]. (That's an old Yiddish joke.)
-->'''Gryphon:''' But [[spoiler:a herring]] isn't green!\\
'''Helena:''' You can paint it green.\\
'''Gryphon:''' It doesn't hang on the wall!\\
'''Helena:''' You can nail it to a wall.\\
'''Gryphon:''' But [[spoiler:a herring]] doesn't ''whistle!''\\
'''Helena:''' Oh, come on. I just put that in to stop it from being too obvious.
%%* The [[http://www.youtube.com/watch?v=cV0tCphFMr8 "Bridge of Death" scene]] (TheseQuestionsThree) from ''Film/MontyPythonAndTheHolyGrail'' parodies this trope.
[[/folder]]

[[folder:Gamebooks]]
* Constantly in ''Literature/LoneWolf'', where all your enemies use number problems to protect their stuff. In a gamebook with numbered sections, of course, number puzzles are the easiest to implement, and leave little possibility of cheating for the player. Which made the page randomization given to some editions especially stupid.
[[/folder]]

[[folder:Literature]]
* In "HowKazirWonHisWife", a king sets his daughter's suitor Kazir puzzles in order to assess his intellect. If Kazir fails, the king will not permit his daughter to marry Kazir.
* ''Literature/HarryPotter''
** In ''Literature/HarryPotterAndThePhilosophersStone'', Dumbledore banks on these to hinder Voldemort from getting to the Philosopher's Stone. Most of the puzzles placed to guard the Stone aren't truly puzzles (rather than leave a spell to ask you how to defeat Devil's Snare, Dumbledore let Professor Sprout decide that it would be much more effective to just set the plant on anyone who came through); notably, the exception is Snape's logic puzzle with the potions: "Most wizards haven't got an ounce of logic; they'd never get out alive." When Harry reaches the final room [[spoiler: he realizes this is a SubvertedTrope. It's made clear that Voldemort could never have retrieved the Philosopher's Stone from the Miror of Erised, no matter how smart or clever he was in bypassing the other defenses. Only someone who ''didn't want to use it'' would be capable of doing so.]]
** Tto gain entry to the living quarters of the House of Ravenclaw, one must answer a intellectual riddle. This is designed to help the Ravenclaws increase their intellectual capacity, so it's ''literally'' "only smart people may pass". It could even be intentional: perhaps Rowena considered all smart people honorary Ravenclaws? The Pottermore welcome message for Ravenclaw goes even further in this direction. It states that "it's not unusual" to see twenty or more Ravenclaw students trying to solve the day's riddle together, and that it's a great way for first years to learn from older students. It also says that Ravenclaws "learn quickly".
** In the fourth book Harry stumbles on a sphinx in the labyrinth and has to solve its riddle.
* In H. M. Hoover's ''Literature/ThisTimeOfDarkness'' the main character has been an outcast because she is literate, in a world where people are trained from childhood to be stupid and ignorant. When she comes to a locked door containing a clearly written explanation of how to open it and disarm the guard lasers, she realizes with horror that whoever put the door there intended to kill anybody who went through who couldn't read - that is, if ''anybody else'' went through the door, they'd be killed.
* In ''Literature/TheMoteInGodsEye'', the alien Moties have museums that are locked using astronomical puzzles. This is {{justified|Trope}}, since the museums are meant to help restore their civilization after the Dark Ages caused by inevitable, unstoppable population explosions, so the puzzles keep barbarian savages from busting the museum's lasers by using them to smash open walnuts.
* A variant occurs during ''Franchise/TheDarkTower'' series, when Blaine, [[spoiler:the insane supercomputer/monorail]] voluntarily takes the heroes to their destination, but agrees to let them live only if they can come up with a riddle ''he'' cannot answer. The catch is that Blaine has [[spoiler:computer-access to the Dark Tower, and can therefore draw on the knowledge of riddles from ALL dimensions in existence. He is only defeated by BAD riddles, i.e. Eddie's horrible schoolyard jokes with no logical answers, which enrage Blaine to the point of blowing his own dipolar circuits]].
* One of the gadgets used by the mysterious [[ArcWords V.F.D]] in Lemony Snicket's ''Literature/ASeriesOfUnfortunateEvents'' is the "Vernacularly Fastened Door", a lock which can only be opened by answering trivia questions. It is a theme of the series that the good guys are more well-read than the bad guys.
* ''Literature/{{Redwall}}'' series has many of these. The first book, for instance, has a series of riddles left by Martin the Warrior that lead to the location of his legendary sword.
* Downplayed and parodied in Creator/RogerZelazny's ''Literature/TheChroniclesOfAmber'' series. Merlin encounters a Sphinx that will eat him if he can't guess the answer to a riddle. Merlin gives a plausible answer, but the Sphinx is looking for a specific one (that is virtually unknowable, relating to a then-obscure aspect of the story's world). Merlin argues with the Sphinx, eventually getting the concession that the Sphinx will let him pass if he can come up with a riddle the Sphinx can't answer. Merlin does so, with "What's green and red and goes round and round and round?" [[spoiler:A frog in a Cuisinart]]. This is echoed in a later book when another guardian refuses to use this sort of test, but just for fun asks a riddle anyway -- and it's the same one Merlin posed.
* The Riddle Game in ''Literature/TheHobbit'', since Gollum's kinda nuts. [[spoiler:And in the "true" version, [[RetCon which is the only one you're likely to read nowadays]], he intended to go invisible using the ring and kill Bilbo anyway.]] Then there's the in-universe debate on whether Bilbo technically cheated. It was concluded that "What have I got in my pocket?" shouldn't have been counted as a riddle at all, but it's arguably fair since Gollum accepted the riddle by trying to answer, even negotiating for three guesses. It should also be noted that Gollum demands three guesses, and guesses ''four'' things.
* ''[[Literature/TheLordOfTheRings The Fellowship of the Ring]]'' subverts this with the gates of Moria; what's taken to be a riddle is just a literal instruction, although knowledge of Elven script ''is'' required to know that there is a password at all. You could ''accidentally'' open it by reading the untranslated inscription out loud.
* ''Literature/{{Discworld}}''
** Tolkien's door gets a ShoutOut in Creator/TerryPratchett's ''Discworld/WitchesAbroad'':
-->''She struck the door and spake thusly: "Open up, you little sods!"''
** Terry Pratchett has a lot of fun with this trope in ''Discworld/{{Pyramids}}''. Pteppic meets the sphinx of Greek mythology -- and gets into a three-page discussion about how the classic riddle ("What is it that walks on four legs in the morning, on two at noon and on three in the evening? -- A man") doesn't make a lot of sense. The final version: "What is it that, metaphorically speaking, walks on four legs for about twenty minutes just after midnight, on two legs for most of the day (barring accidents) until at least suppertime, after which it continues to walk on two legs or with any prosthetic aids of its choice?"
* Exploited in ''Literature/DiamondDogs'' by Creator/AlastairReynolds. The novella concerns the discovery of a sealed alien tower that can only be ascended by answering successively more difficult math problems in various chambers. The characters in the story are eventually forced to augment their own intelligence with [[NeuralImplanting neural implanting]] just to proceed. More sinisterly, the doorways between each chamber get smaller each time, forcing the characters to also [[BodyHorror modify their bodies to fit]]. The exploitation comes when narrator realizes that the Tower probably doesn't have ''anything'' at the top. It exists solely to goad gullible intelligent species into exploring it. When they get to the top, the tower "harvests" them like a Venus Fly Trap.
* Creator/AllenSteele's ''Labyrinth of Night'' features an alien complex on Mars entered through a series of locked doors with puzzles that require increasingly more intelligence to solve (and [[RagnarokProofing still-active]] {{death trap}}s for the unwary). The archaeologists were baffled by the last chamber, which just played music, until they brought in a musician to jam with it, proving we have culture as well as brains.
* In the Polish children's book ''Satan From The 7th Grade'', protagonist Adam follows the clues and riddles that a Napoleonic-era soldier left for his brother, to find where he hid the treasure he brought back from the war. The attempted justification is that the soldier picked things only his brother would know, such as the book they read together when they were studying Italian.
* Pick a ''Literature/DeltoraQuest'' book. ANY ''Deltora Quest'' book. Chances are you'll find a riddle that needs solving, some cryptic code that needs cracking or some other puzzle that needs figuring out. Probably more than one.
* Dan Brown attempts this in ''Literature/TheDaVinciCode''. There are such gems as the "strange script" of an unrecognised language that a symbologist, the granddaughter of a da Vinci expert and ''another da Vinci expert'' spend about five pages puzzling over. Two pages into this sequence, there's a copy of it printed -- it's in da Vinci's trademark mirror writing.
* From ''Literature/AlicesAdventuresInWonderland'': "Why is a Raven like a writing desk?" Creator/LewisCarroll himself wrote: "Enquiries have been so often addressed to me, as to whether any answer to the Hatter's Riddle can be imagined, that I may as well put on record here what seems to me to be a fairly appropriate answer, viz: 'Because it can produce a few notes, though they are very flat; and it is [[StealthPun nevar]] put with the wrong end in front!' The canonical answer, of course, is; "[[spoiler:I haven't the slightest idea.]]" Despite WordOfGod, people keep trying to "answer" the riddle. Some of the more famous "answers" include:
** "Because there is a B in both and an N in neither."
** "Because they both have inky quills."
** "Because Poe wrote on both."
** Another answer, in [[http://www.cyphertext.net/~vix/cheshire.txt "The Cheshire"]] by Bill Kte'pi. The GenreSavvy title character [[spoiler:says the outright truth, "It's nothing like a writing desk", which was the point of the original riddle; to show that the Wonderland inhabitants were quite insane.]]
** Yet another, from a Christopher Stasheff book: [[spoiler:"Both require quills to truly take wing."]] Naturally, this hasn't been a really ''valid'' answer for some time.
** An annotated version of ''Alice in Wonderland'' suggested "It stoops with a flap," or a flap of wood that creates an incline on which to write.
** Another answer: [[spoiler:"You can't ride either one like a bicycle."]] It just seems to fit Wonderland so very well.
* The Crown of All Things in ''[[Literature/NightWatch The Last Watch]]'' was sealed in a most ingenious manner, but Merlin thoughtfully left a rather clever riddle behind. This was {{justified|Trope}} in that providing a hint was part of Merlin's idea of fair play, and it later turned out he had a very good reason to make it possible for someone intelligent to get their hands on it.
* ''Literature/RomanceOfTheThreeKingdoms'', Cao Cao is fond of word games, including leaving instructions in the form of incredibly involved plays on Chinese characters. The only problem was that the guy who solved them, Yang Xiu, made Cao nervous, both for his intelligence and for supporting one of Cao's younger sons rather than Cao's chosen heir. [[spoiler:Cao Cao would have Yang Xiu executed when he interpreted one of Cao Cao's signal phrases (chicken neck) as a sign that Cao was preparing for retreat. It should be noted that Cao really was planning a retreat, but canceled the retreat so he could have an excuse to do away with Yang.]]
* Doubly subverted in Piers Anthony's novel ''Literature/{{Macroscope}}''. The "Destroyer Signal", a radio signal picked up by a SETI search, appears at first to be a treasure trove of alien scientific knowledge that a few of the smartest humans may be capable of understanding, but turns out to be designed to overload their brains and burn out their minds with too much knowledge. Later in the book, it turns out that it is actually an "only smart ''and good'' people may pass" test, designed to destroy any intelligent mind not belonging to PerfectPacifistPeople, to prevent all the tech (especially FTLTravel) from falling into the wrong head.
* In the short story "The Most Precious of Treasures" by Desmond Warzel, the protagonists must solve a room-sized QueensPuzzle in order to pass from one room of a dungeon to the next. It's purpose is to allow people in and keep beasts out, thus it's really a case of Only Sentient People May Pass; the implication is that the builder chose a [[StockPuzzle well-known puzzle]] on purpose.
* In ''Literature/StarTrekTyphonPact'' (part of the Franchise/StarTrekNovelVerse), the home and office of the Tzenkethi Coalition's Autarch is inside a building with a flexible and highly changable design. To access the house requires contemplation of mathematical principles and aesthetics, to puzzle out the likely position of concealed openings. Agents of the Autarch are therefore tested every time they report to the building, and must demonstrate their worth by finding a way inside.
* In the novelisation of ''Earthsearch II'', the puzzle at the climax is extremely simple but highly effective: [[spoiler:the collected technological knowledge of the pre-[[DarkAgeEurope Dark Ages]] Earth is guarded by a metal door that fits its frame too tightly to open, and is kept so by the slight heating from an embedded radioisotope; one must be observant enough to spot the extra warmth, smart enough to figure out that cooling the door will allow it to open, and sufficiently technologically advanced to achieve that on an overheated planet that has been in drought for over three centuries.]]
* ''Literature/SeptimusHeap'' has the Wright of the Widdle in ''Queste'', where the protagonists have to guess the meaning of some expressions that refer to some symbols to enter the House of Foryx.
* The Polish novel ''Cylinder van Troffa'', set mostly in a dilapidated old city inhabited by gangs. A small group of scientists, while in cold sleep, protects their base from the marauding uneducated hooligans with a door that demands solving a simple algebra problem to open. Once in a great while, the invaders manage to stumble across the answer... only to find themselves imprisoned in [[{{Oubliette}} a small room]] unless they can solve a problem from derivative calculus. None of them ever managed that.
* In the Warhammer 40k novel ''The Iron Guard'', this is a notable WeaksauceWeakness of the the "changed". While they are quite cunning in other regards, their altered brains seem incapable of solving simple spatial puzzles. The unchanged survivors use this fact to construct barricades that most humans could easily dismantle by moving a few pieces around but the "changed" brains are incapable of reasoning out the puzzle.
* ''Literature/JourneyToChaos''
** This happens twice in ''[[Literature/AMagesPower A Mage's Power]]'':
*** When Eric tries to enter the Temple of Zaticana, his path is blocked by the temple's guards. They declare that "No earthbound mortal may cross this temple threshold." Eric quickly figures out that instead forbidding mortals to enter the temple, the statement means they want him to jump across, i.e. prove he is not "earth bound".
*** The entrance to the Black Cloak's hideout is carefully hidden and guarded. To enter without setting off alarms, Eric has to use several spells in combination
[[/folder]]

[[folder:Live-Action TV]]
* GameShows examples:
** Often used when giving away prizes to make sure that it's "skill-based" rather than luck-based, even if it's effectively luck-based. Generally the question is very simple, allowing anyone to answer it. There are entire shows based around this which intend to collect money from unwary viewers via premium-charged phone or SMS, giving away only a token prize for the winner. Another possibility is to make an "unsolvable" puzzle, such as "count the money in the picture" (when the answer is finally shown, it is revealed that there were coins in the picture ''completely obscured'' by other coins) or "find the names of 3 bands in the letter square" (which is filled with misspelling of popular band names and the answer is 3 obscure bands with nondescript acronym names). Multiple callers can attempt to answer but generally none will succeed, so nobody gets the prize because they weren't "smart" enough.
** In some places (Canada, for example) the law prohibits "gambling" (e.g. a lottery, ''even if no entry fee is charged'') but permits "contests of skill". Apparently, correctly answering "2+2=?" makes it a contest of skill as far as the law is concerned, even if the winner is then randomly chosen from the correct entries (i.e. all of them). In other words, LoopholeAbuse.
* The first episode of ''Series/AreYouAfraidOfTheDark'', "The Tale of the Phantom Cab": The woods are haunted by the ghosts of lost hikers and campers who found Dr. Vink's cottage. He would send them to board the Phantom Cab and die in a replica of the same crash that killed the driver. Why? Because none of them (until the two boys in the tale) could answer his riddle: "What has no weight? Can be seen with the naked eye? And if you put it in a barrel, it will make the barrel lighter?" [[spoiler: A hole.]] Other common entities that satisfy this description: [[spoiler: fire, "A flashlight beam."]]
* ''Franchise/StargateVerse''
** The ability to identify the first six digits of pi and the radius of a circle -- guarded an Asgard communication device that would have allowed the populace of a world to speak with their "god" and learn all kinds of things about the Universe in ''Series/StargateSG1''. It's justified in that Thor didn't want to speak directly with a society until they achieved some kind of scientific knowledge.\\\
** In "The Tomb", a ruined temple to the Goa'uld Marduk was blocked by a great stone door inscribed with the [[MesopotamianMythology Babylonian creation myth]]. Opening the door required pressing the sections of the text that were incorrect, things that in theory only the priests of Marduk would know. Fortunately Daniel Jackson has studied Babylonian mythology and reads the language.
** The Ancients, or at least Merlin, were also fond of using these to guard superweapons. The Dakara Superweapon, built by The Ancients, capable of wiping out all life in the galaxy, requires understanding of Ancient language. Failing that, ''using the notes of someone who does'' will also do.
** In "Avalon", Daniel has to solve a riddle to figure out which pot contains a gold coin and Mitchell gets stuck trying to translate an Ancient language.
** During the quest to find the Sangraal, TheTeam had to use four virtues to reach the Sangraal and one of them was wisdom.
** ''Series/StargateAtlantis'' had such puzzles, like finding the ZPM by using the numbers 1-9 to make a magic square, part by desperation, part by realizing the significance of the number 15.
* ''Series/DoctorWho''
** "42" has a bunch of locked doors that require trivia questions to open. In theory this is a passcode system, not a puzzle -- the crew of the ship in question set the questions with the intent to be the only group who could give all the right answers. Notably, one of them set his favorite color as an answer. However, "the crew's changed since we set the questions," they may have been a little drunk at the pub quiz they got the questions from, and some of them had died horribly, explaining the fact that all the questions aside from the guy's favorite color apparently have to be answered by the Doctor or Martha. Granted, this episode is set far enough in TheFuture that a question referencing Music/TheBeatles is listed in the category of "Classical Music".
** "Death to the Daleks" has a test which takes the form of a series of death traps, killing anyone not smart enough to find the solution quickly. The Doctor speculated that people who can pass might have some other knowledge that might benefit the city.
** The Hartnell-era story "The Daleks' Invasion of Earth" contains a particularly nice (or nasty?) example. Human captives of the Daleks are imprisoned in cells aboard their ships. The Doctor examines the door-locking mechanism and works out a way to deactivate it and thus escape. [[spoiler: He does, and it turns out that the mechanism is actually an intelligence test - those smart enough to escape their cells are potentially dangerous and are sent to be turned into [=RoboMen=].]]
** The Cybermen do something similar in the Troughton-era "The Tomb of the Cybermen". Anyone skilled enough in symbolic logic to get into the tombs [[spoiler:and awaken the Cybermen, is clearly a good candidate for conversion to a Cyberman.]]
* In ''Series/BabylonFive'', an alien probe promises to transmit its vast store of knowledge to any species that passes its intelligence test. [[spoiler:It's actually a [[BigBulkyBomb bomb]] that will [[EarthShatteringKaboom destroy the first planet]] to answer correctly, taking out any up-and-coming civilization that might one day rival its creators.]]
* Parodied brilliantly in the "talking frog" scene of ''Series/TheTenthKingdom''. "One door leads to safety. One door leads to a horrible death." The heroes [[TakeAThirdOption then find a new solution]]...
* Parodied again in ''Series/TheOfficeUS'', where Dwight keeps asking Ryan one logic riddle after the other. Ryan answers them so quickly that Dwight barely has the time to say the first few words before he gives the correct answer.
%%* A staple of ''Series/{{Knightmare}}''.
* Subverted in ''DoubleTheFist''. The Womp has to get past a pair of "one always lies and the other tells the truth" guardians, but he's TooDumbToLive and when the increasingly frustrated guards try to explain how the puzzle works the liar accidentally tells the truth, causing his head to explode.
%%* A common task found on ''Series/TheAmazingRace''.
* This happens on ''NoelFieldingsLuxuryComedy'', when Fantasy Man and Chief Woolabum want to cross the river but are stopped by a schizophrenic flag named Bobbatron, who demands the answer to a [[RiddleMeThis mind-bogglingly bizarre riddle:]] "If it takes a year to drink a horse, how long does a Spanish priest have to cry for, when rolling up a hill against a north-facing breeze... bearing in mind that it's winter and dark, and the priest is covered in ball bearings and his own shit?" Naturally they TakeAThirdOption, pushing Bobbatron into the river and crossing the bridge as if nothing had happened.
* Dr. Nigiri sets one of these as final barrier on his plan to takeover the console in the ''Series/{{Pixelface}}'' episode "The Problems of Dr. Nigiri". It falls to Sgt. Riley -- as the only one not brainwashed -- to attempt to solve it.
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/{{Exalted}}''
** [[spoiler: In the ''Time of Tumult'' the players have to select the wrong answer in a classic KnightsAndKnaves puzzle. This is fair since the [=PCs=] are navigating a maze specifically designed to kill anyone but the creators ''and they know it''.]] Only Really Smart People may pass.
** ''Exalted'' later plays it straight and justifies it in ''Under the Rose'', which has a section of puzzle-based deathtraps designed by Autochthon, the Great Maker. A side-note mentions that as part of his inhuman mindset, Autochthon is ''physically unable'' to design any form of defenses without including puzzle-based deathtraps.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/DiscworldNoir'' looks like it's headed for this when an ancient guardian wants to ask you a riddle to see if you are worthy to receive the MacGuffin. Then come the subversions, first by the guardian who happened to forget the riddle during his 400-year-wait (but still insists to only hand the item to those who answer it) and then by Lewton who points out that someone of the ''un''worthy faction would just hack the weaponless guardian to pieces. As he's in somewhat of a hurry, he gives the guardian the option to hand over the McGuffin -- or he'll just ''pretend'' to be unworthy enough... The guardian relents.
* ''VideoGame/RogueGalaxy'' -- There's a skyscraper sized block puzzle guarding ancient ruins.
* ''VideoGame/SuperMarioRPG''
** While slogging through Bowser's Castle toward the end, Mario reaches six doors, leading to instances of three kinds of challenges. Two are straight combat, two are platforming action, and two are a gauntlet of dime-store brain teasers, hosted by a green Hammer Brother named "Dr. Topper". On the menu: peg-jumping puzzles, counting games, trivia quizzes about the RPG itself, and an infuriating "Who finished what place in a triathlon?" word problem. You only have to pass four of six doors, but randomly speaking, you'll have to face at least one of them.
** There are some in the Sunken Ship. A series of platforming challenges give nautically themed clues to a six-letter word puzzle to enter the Boss Room. None of the challenges have to be completed, if a player can suss out a fitting word from the given letters. Both the quiz-gauntlet and the word puzzle are relatively simple affairs, but for younger players, they could be pretty stymieing, as they relied on critical thinking and some outside information.
* In both ''VideoGame/PaperMario'' and its sequel, there are puzzles where you're required to answer questions about the game to proceed (or at least, to avoid a tricky boss fight).
* ''VideoGame/FinalFantasyVI'' had a very interesting minigame built into the plot, wherein the team has to sit down for dinner with [[BigBad Emperor Ghestal]] and make small-talk. Several questions are asked of the player, for toasts and such, most of which offer three possible answers: sucking-up, magnanimous, and vindictive. He also answers questions about some plot-points, and then quizzes on which one was asked first. The game goes on through the dinner no matter what; since it's not possible to "lose", it's not exactly a critical puzzle, but "winning" nets the player lots of nice rewards. The puzzle is figuring out the right answers - each has a score attached to it, with the rewards based on the total earned. The answer isn't entirely obvious from the context, but the Emperor is trying really hard to apologize, so [[spoiler: you want to take the magnanimous answers, because you don't to degrade his apology, and you don't want to be rude at a dinner party.]]
* Parodied in the [=PS1=] game ''Shadow Madness''; at one point, the heroes encounter a talking stone mouth located in a crypt that's been unoccupied for centuries. When it tells them to answer three questions in order to pass, one of the heroes asks why, to which it responds with, "You'd be bored too if you were me, honey."
* ''Franchise/StarWars: VideoGame/KnightsOfTheOldRepublic''
** Arithmetic puzzles get used for everything from decryption to demolitions.
** The trivia questions both the ancient Rakatans and Darth Revan used to cover the tracks to their secret base. There's also a ShmuckBait sidequest that is solved by winning a riddle contest with a prisoner stuck in a mind trap.
** Several puzzles in ''KOTOR'' are in fact classic puzzles given a more context appropriate reskin. The damaged extractor control system on the water planet is the same "measure 4 liters using only a 3 liter and a 5 liter container" seen in ''Die Hard 3'', while the Sith tomb's energy ring transfer puzzle is really a jazzed up TowersOfHanoi.
** The ''Brotherhood of Shadow'' game mod has a wicked one. A Czerka employee was trying to seal off the mining tunnels from his crazed co-workers. He set up a system requiring accessing several terminals in succession and answering questions about "basic galactic history" (read: lore from the StarWarsExpandedUniverse) in order to open the doors.
* In ''VideoGame/KingsQuestVI'', in order to get anywhere beyond a small beach on the Isle of the Sacred Mountain, you have to bypass a little obstacle aptly called the "Cliffs of Logic". That the Cliffs are an ancient test of intelligence is only the in-character explanation; out of character, the game practically demands you look up the solution in [[{{Feelies}} the guidebook that came with it]].
* ''Franchise/ProfessorLayton'' has many of these.
** ''Webcomic/PennyArcade'' [[http://www.penny-arcade.com/comic/2008/02/13 parodies it]], suggesting it's a "Logic Opera": "every person you meet breaks into "puzzle" the way that Viking ladies tend to break into song, out of nowhere." The first game in the series, ''[[CharacterNameAndTheNounPhrase Professor Layton and the Curious Village]]'', actually turns out to have invoked the trope: [[spoiler:a guy deliberately set up all the puzzles to test the intelligence of those seeking his treasure.]]
** Becomes literally so as in every single game there is a guard of some sort preventing you from entering the dungeon(s) if you haven't completed a certain number of [[SolveTheSoupCans soup can puzzles]], and you thought you could ignore the hard ones and only miss out on OneHundredPercentCompletion!
** In the ''Azran Legacy'' game, there's the Azran tombs where you have to solve the ball-rolling puzzles to get from room to room. Did Hershel never think to jump over that hole? No? How about follow Randy, who's pushing the balls? No? Only the ridiculously idiotic intelligent may pass, it would seem here.
%%* ''VideoGame/{{Xenosaga}}'' series.
* Shows up in the mad Finster's mind in ''VideoGame/{{Wasteland}}''; you do have to get these right. Note that this guy's not exactly sane, and the fact that you're wandering in his brain with laser machine guns trying to kill him isn't helping his mental state much.
* ''Franchise/{{Pokemon}}''
** Played with in ''Diamond / Pearl''. One Gym presents you with three doors and a mathematical question - you go through the door associated with the correct answer. The thing is, the questions are so easy - and the main character is even given a calculator right at the start of the game - that the trainers who battle you behind the incorrect doors assume you ''deliberately'' got the answers wrong. One girl is pleased that you decided to battle her; another cheerfully agrees with your 'battle everyone' philosophy; and one boy complains 'why don't you just answer the questions properly?'. Then there's the last question: "What was the answer to the first question?" If you weren't really paying attention because the questions were so easy, you'll likely get it wrong.
** Played straight in the rest of the games such as the second-last Gym of the first generation has a series of doors that can only be opened by answering a series of general-knowledge questions pertaining to the Pokemon world. Failure to answer correctly results in you having to fight the trainers guarding the doors -- [[LevelGrinding and since they give extra experience and cash anyway,]] why tax your brain? The questions are for those who don't want to battle the trainers. You don't even need to answer the questions. Talk to the trainers to battle them and the door automatically opens if you win, whether you answered the question or not.
* ''VideoGame/LufiaIIRiseOfTheSinistrals'':
** Every floor of every dungeon, cave, castle, tower or mansion is littered with puzzles of all sorts that you must complete to open doors. It gets so extreme that one can reasonably argue that ''Lufia II'' is a puzzle game with a large story and RPG-elements in it.
** There is also a secret room in one of the later dungeons that has "the hardest puzzle in the world" which involves sliding platforms around and around for about 20-ish rounds, until you have the platform with the treasure chests filled with neat loot in front of you.
* In the InteractiveFiction game ''VideoGame/{{Gateway}}'', you need to solve a puzzle to get to the first Heechee device. The puzzle ("which of these is not like the others") was put there so the species on the planet in question couldn't get at the device before they became smart enough. Hence, OnlySmartPeopleMayPass, which was its point.
* ''VideoGame/Disgaea2CursedMemories'' has a minor boss in the InevitableTournament tries to challenge the heroes with the mother of all geo puzzles, causing the page quote from Tink in regards to IdiotHero Adell. Adell [[HiddenDepths takes one glance at the puzzle and states its correct solution without missing a beat]], freaking out the puzzle creator and the rest of the heroes. Of course, to the player the real puzzle is getting to the solution that Adell pointed out. It's at the end of a maze of No Entry panels guarded by monsters. Although if you have enough range on your spells (which depends on how many times you've cast it before) you can hit it from the starting position.
* In ''VideoGame/MediEvil'', the player can only gain entrance to the Asylum after answering a number of riddles "so perplexingly complex that no man has ever solved them" posed by Jack of the Green. Interestingly, the puzzles themselves are fairly easy to figure out, except for perhaps the last one. The real problem is in figuring out how you're meant to ''answer'' them.
* UsefulNotes/{{Amiga}} game ''VideoGame/TheChaosEngine'' (''Soldiers of Fortune'' on consoles) features fairly inventive puzzles which can only be interacted with by shooting them. In rooms full of enemies. Often, you'll have solved the puzzle ''without ever noticing it existed''.
* Used over and over again in ''VideoGame/TalesOfEternia'', the first ''Tales'' game with the bright, involved, and unique sort of puzzles that also contributed to ''VideoGame/TalesOfSymphonia'' being the hit it was. Then, without warning, subverted at the beginning of Volt's ruins: the SmartGuy Keele has been left behind, so while the rest of your party is busy scratching their heads and staring at the obtuse riddle on the front gate, Max walks up to the door and body-slams it down. The rest of the dungeon, of course, is full of puzzles, but damn if the scene wasn't hilarious.
* In ''VideoGame/TheWorldEndsWithYou'', on the 4th day [[spoiler:of the third week]], you are boxed off by invisible walls and to open up these walls, you need to open up special boxes, which won't open unless you solve puzzles involving defeating specific Noise symbols. Additionally, to obtain the Secret Reports, you are required to get hidden items as part of your objectives, and are given cryptic hints as to where to find them, such as "Meet up with the secret" ([[spoiler:examine the Statue of UsefulNotes/{{Hachiko}}]]) and "SHOWN A DREAM" ([[spoiler:anagram of "Shadow Ramen," a restaurant where you will find one of the hidden items]]). Also, some of the clues as to the daily objectives ([[spoiler:mostly in week 2]]) are rather cryptic. Mind you, the characters manage to work them out, saving the player from the extra thought in those cases, at least.
* The ''VideoGame/{{Myst}}'': The D'ni people in general were enamored of puzzle games, and Atrus picked up on it quickly when taken to the ruined city. It's lampshaded in a parody of Revelation, by a frustrated [[PlayerCharacter Stranger]] working on the fireplace puzzle:
-->"I mean, does he [Atrus] not ''mind'' people breaking in as long as they have an IQ of 150 and brilliant abstract logic skills? No wonder this place is always being smashed up by twisted geniuses seeking revenge on the entire family..."
* In ''VideoGame/{{Anachronox}}'', to board the shuttle to Sunder (a PlanetOfHats populated by scientists), the heroes must pass the Brain Bouncer, who demands explanations of complex scientific theories to ensure that the hopeful passenger really is a scientist of high caliber. This is then parodied when your helpful robotic buddy downloads the entire galactic scientific database into his memory, and you have to pretend to speak a language that the bouncer doesn't, so your robo-buddy can helpfully "translate" for you. Of course, there are two additional (humorous) swerves: the bouncer speaks ''all known languages'' (forcing you to "invent" a language), and at one point, after provided an answer that can be as short as three sounds and as long a twelve sounds, your robo-buddy prattles on for long enough that the scene fades out.
* ''Franchise/ResidentEvil'': why does a scientific lab require you to manipulate chess pieces to open a locked door? No one knows. The series handwaves it by saying that Spencer, the man who designed the mansion, was insane and paranoid.
* ''VideoGame/{{Portal}}''. The puzzles at the beginning exist not to test the Portal Gun, but to see whether Chell is smart enough to use it.
* ''Franchise/SilentHill''
** The franchise has a lot of this, but ''VideoGame/SilentHill3'' stretches it into true absurdity with a puzzle requiring an [[GuideDangIt astoundingly thorough knowledge of the works of Shakespeare]] to pass (on Hard mode). Of course, it's ''Silent Hill'' we're talking about here -- making sense is purely optional and any puzzle that can be explained with sufficiently elaborate EpilepticTrees (like, say, a 20 page forum debate between fans who have memorized the game) is obviously logically sound by the laws of the place.
** There's also quite a few verbal puzzles in the game that are obscenely simple if you're familiar with the source. The source may be a common Japanese nursery rhyme that makes it impossible for American audiences to solve without some sort of reference, or aspects of American culture that seem blatantly obvious to us but are downright InsaneTrollLogic to the original Japanese audience. Which, given the whole [[MindScrew confusing nature]] of the series, may be entirely intentional.
* The ''Zelda'' series, being a platformer, has many of these in every dungeon. Forget fighting monsters, the meat of the dungeons is pushing around blocks in a grand scaled puzzle box to get to the {{macguffin}}. In ''VideoGame/TheLegendOfZeldaTwilightPrincess'', there is a point where Wolf Link, trying to enter the sacred grove that houses the Master Sword, is confronted by two malevolent-seeming statues. The statues explain that if he can get them back onto the spots where they're supposed to be standing, he can enter. Since the one of the statues will mimic his movements and the other will do the opposite, he has to jump around in the correct sequence to get them to shift onto the indicated squares and thus open the door.
* The ''VideoGame/KingdomOfLoathing'' does this with the Altar of Literacy that people have to pass to gain access to the chat. Its trials include typing a sentence and answering the "unspeakably difficult" trivia question "What colour was George Washington's favorite white horse?" Even though it's meant to be a comical RPG in general, it is an unspeakably good idea.
* ''VideoGame/TraumaCenter: New Blood'': to [[spoiler:escape a pit filling with water, the two doctors and nurse that have refused to help the BigBad have to solve a complicated puzzle. To do so they have to "connect the four friends," meaning they connect the pegs that match in color to each other. It's surprisingly difficult, which is explained by the puzzle being popular among college students and the like. If you don't solve in time, they all drown.]]
* In ''VideoGame/ValkyrieProfile'' there is an Egyptian-themed pyramid dungeon, in which the Sphinx presents the famous riddle to Lady Valkyrie. Her reply is simply "..." and she is allowed to pass.
* This is the central premise behind the gameplay of ''VideoGame/AnotherCode'': For some unfathomable reason, the designers of the mansion on Blood Edward Island thought that it would be more efficient to use logic puzzles instead of keys or handles. * ''VideoGame/BrainLord'' is ExactlyWhatItSaysOnTheTin, and EVERY puzzle that doesn't involve 'kill all enemies in the room' will genuinely test your reasoning ability....or patience, if you go for trial and error.
* In the game ''Brothers Pilots'', a fridge is locked by a puzzle. After you open it, a cat comes out and opens the door your characters were unable to open by simply pushing it (your characters try to pull it). Apparently, solving this puzzle was simpler than opening an unlocked door.
* Subverted in ''Videogame/PlanescapeTorment'': the night hag Ravel Puzzlewell asks everyone who seeks her out the sphinx-like question, "What can change the nature of a man?", then tortures and kills everyone who gives the wrong answer. [[spoiler:Turns out she wasn't looking for a particular answer. She was interested in the response of a particular ''person'', that of her former lover.]] The Nameless One's "best ending" has him stating that [[spoiler:many things can change the nature of a man. Belief, regret, love, etc. Then he gets to revive all his companions (except the evil pyromaniac mage) and say goodbye before enlisting in the Bloodwar.]]
* ''VideoGame/BaldursGate II'' has several such moments. The oddest riddle is one that makes sense as game dialogue but would be quite horrible if someone came to you and spoke it like this:
-->''A princess is as old as the prince will be when the princess is twice as old as the prince was when the princess' age was half the sum of their present age. Which of the following, then, could be true: the prince is 20 and the princess is 30, the prince is 40 and the princess is 30, the prince is 30 and the princess is 40, the prince is 30 and the princess is 20, or, they are both the same age?''
** [[spoiler: The prince is 30, the princess is 40. Any age with the same ratio will also do.]]
* In ''VideoGame/{{Exile}} II,'' to address the Vahnatai Council you must complete two out of three tests: the Test of Strength (a series of combats), the Test of Speed ({{outrun|TheFireball}}ning a wall of [[{{Hellfire}} quickfire]]), and the Test of Mind (word games, math puzzles, riddles, and a maze). You might suspect that most players would skip the latter. In the remake, ''{{Avernum}} 2'', the Test of Mind was replaced with the Test of Patience (a BlockPuzzle).
* ''VideoGame/BanjoKazooie''[='s=] final level is a board game. It practically lampshades this trope, asking questions about various events in the game as well as matching sound effects and jingles to what they mean.
* ''VideoGame/DragonAgeOrigins''
** At one point, the character must complete a relatively easy puzzle using party members to stand on plates to create a bridge to reach the ashes of the prophet Andraste. If Alistair is in your party, he'll comment on this:
--->'''Alistair:''' Maker's Breath, Andraste only favored the clever, it seems.
** Leliana also jokes about how you may have to "all join hands and sing a happy song to get across." The quest also has a room full of spirits who give you riddles and attack you if you answer incorrectly. Some of them will let you off if you admit you can't answer - emphasis on ''some''.
** The Mage origin story has a sloth demon that you can either fight, or correctly answer his riddles.
* In the ''VideoGame/DragonAgeII'' DLC ''Mark of the Assassin'', the vaults of Chateau Haine are like this. ''Normal'' people keep their valuables safe with locks and, perhaps, guards. [[UpperClassTwit Duke Prosper]] prefers to use puzzles.
* ''Star Trek: The Next Generation: ”VideoGame/AFinalUnity'': The room guarding the Fifth Scroll.
* ''VideoGame/{{Killer7}}'' has a number of strange puzzles in bizarre and unlikely places. Of course, [[MindScrew considering the game we're talking about]], words like "strange" and "bizarre" are highly relative...
* ''CastleOfDrBrain'' is built on this, with plenty of puzzles, labyrinths and other challenges. However, the doctor isn't trying to keep you out, just test you to see if you're good enough to become his assistant.
* Likewise, ''VideoGame/QuestForGloryIV'' has Dr. Cranium (supposedly an ancestor of Dr. Brain), whose lab is behind four different puzzles, though all but one are interconnected. Unlike his descendant though, Cranium just wants his privacy and is sufficiently impressed when you enter.
* ''VideoGame/{{Darklands}}'': The dwarf logic puzzles . (With one exception, which due to writer error is a GuideDangIt.)
* ''VideoGame/GuildWars''
** In ''Guild Wars: Nightfall'', the Dasha Vestibule mission has a room with six pedestals with composite numbers and four with primes. The player must chose two composite numbers such that all four primes are factors of one of the chosen numbers.
** Used as a joke in the "Elusive Golemancer" mission in ''Guild Wars: Eye of the North''. "We designed the traps to keep less intelligent creatures out. We Asura have no problems with them. You, um, you should be fine. Yeah. You'll be just fine."
* In ''VideoGame/DeadSpace2'', [[spoiler:the Marker tests all that it comes into contact with by transmitting a signal that either drives people insane or gives them the knowledge they would need to create a new Marker.]]
* ''VideoGame/{{Fallout}}'':
** In the early games, this is character-based instead of player based, with Intelligence attribute checks, or various skill checks. Ironically, some story quests are actually much easier if your character is extremely stupid since the quest givers will realize that you are to too dumb to complete them and will do it themselves.
** In ''VideoGame/{{Fallout 3}}'' a sidequest in what's left of the Smithsonian requires you to answer trivia questions on American history to open a safe containing some loot.
* ''VideoGame/{{Drawn}}: The Painted Tower'' and its sequel Dark Flight are this in their entireties.
* ''Videogame/ShiningTheHolyArk'' has a puzzle involving weights and scales before you can enter the dungeon proper. Also it has the infamous stone puzzle.
* In ''[[VideoGame/{{X}} X3: Terran Conflict]]'', the New Home plot involves a three-part HackingMinigame. You have to break a four-digit code, then solve a sudoku. The third part is inputting a code you put together from clues throughout the plot.
* ''Franchise/FinalFantasy''
** In ''VideoGame/FinalFantasyX2'', there's a minigame called "Sphere Break". This game revolves around using coins to come up with various combinations of numbers with multiplication and addition. Finding the coins in the game proper is fairly easy, as you just wander around playing the desert minigame until you find the coins you need. The Sphere Break game itself requires quick mental math, something that no amount of grinding or walkthroughs will ever prepare you for. And to add insult to injury, some of the game's best Accessories, as well as a few Garment Grids and the Lady Luck Dressphere, can only be won by playing and/or winning Sphere Break matches, not to mention that the minigame itself can be abused for item farming.
** ''VideoGame/FinalFantasyXIII2'' has the [[http://finalfantasy.wikia.com/wiki/Temporal_Rift temporal rifts]], which offer you one of three puzzles; Tile Trial, Crystal Bonds, or the Hands of Time. Tile Trial is fairly painless, but the harder Crystal Bonds tend to demand very quick reflexes, memorization, and a bit of luck. As for Hands of Time, it's the only one that isn't mandatory to complete the game, and when you attempt one, you'll see why. Etro help you if you decide to go for HundredPercentCompletion, because you have to solve several of them, often going up to thirteen numbers.
* ''VideoGame/FatalFrame''has several doors were locked with numerical combination locks. This wouldn't be so bad (the combinations are hidden in various notebooks and diaries hidden around the mansion), except that the lock itself has the numbers written in kanji and in an archaic arrangement (counterclockwise with "zero" in the top position). Only a minor example for Japanese players, but for Western players this is GuideDangIt territory (at the very least, much harder than the developers intended the puzzle to be). Fortunately, the Xbox remake addressed this by changing the lock to feature numerals rather than kanji.
* In ''VideoGame/ConquestsOfCamelot'', there were several CopyProtection-type puzzles which required not only having the manual but correctly interpreting it as well. One part early in the game played this more straight, featuring a magic barrier that could be passed only after talking to some stones and solving the riddles they gave you.
* Used on you (as the FacelessProtagonist) in ''VideoGame/DarkTales: Murders in the Rue Morgue''. When you first meet Detective Dupin so that you might solve the murder together, he puts you through your paces, solving a series of puzzles in and around his house. He wants to make sure you're up to the task before he lets you come with him.
* ''VideoGame/LiveALive'' has the Intelligence Dungeon in the final stage. You're only allowed to challenge it if you have [[spoiler:Cube]] in your party, otherwise you are merely told "those who rely on strength may not enter here".
* There are a handful in VideoGame/AvencastRiseOfTheMage: two requiring the player to figure out biographical information at the subjects' tombs and another only allowing access to an art exhibit to someone smart enough to reconstruct an artwork.
[[/folder]]

[[folder:Visual Novels]]
* ''Franchise/AceAttorney''
** The series in general is this, with the player either having to find clues, assess evidence, question witnesses or create theories as to how something happened. Only a lawyer (and smart player) is capable of these tasks.
** In the fourth game, Apollo has to figure out how a professional magician pulled off one of his illusions. Not for any relevant reason, but because [[BunnyEarsLawyer The Judge]] has decided that he wants to know how it was done, and that he wants Apollo to explain it to him. Once he understands, they continue with the actual trial.
[[/folder]]

[[folder:Web Comics]]
* The Door test from ''Webcomic/TowerOfGod'' does a subversion on this: The objective was merely to open any of 12 doors in five minutes, but one wasn't told that. One was told one had to open the right door in ten minutes and that the wrong choice would lead to one's death. Over analyzing and thinking is noted as dangerous and likely to kill you as you think about which door to pick for too long. Then Ship Leesoo throws this to the curb by being so smart he figures out the trick behind the test in one minute and opens a random door, impressing the test giver and proving himself to not be TheLoad for his team.
* In ''Webcomic/WapsiSquare'' Monica meets Phix, keeper of the Bibliothiki, who [[http://wapsisquare.com/comic/upforariddle/ asks her a riddle]]. When [[http://wapsisquare.com/comic/theanswerissunshine/ Monica answers]], Phix [[http://wapsisquare.com/comic/itsabooksilly/ gives her a prize]]. Later on Monica takes her friend Shelly to meet Phix, [[http://wapsisquare.com/comic/areyouafraid/ who asks her the same riddle]] [large-format strip]. The twist is that Shelly gives her a ''different'' answer [[http://wapsisquare.com/comic/finalanswer/ but also gets a prize]]. Note that Phix doesn't say that either of the answers are ''right'', she just says "good for you".
* In ''Muse Academy'', if you're in the dorm for science experts, the door asks newbies science questions, but it's to make sure they're at the right dorm.
* ''Webcomic/{{xkcd}}'':
** The KnightsAndKnaves puzzle is played for laughs in [[http://xkcd.com/246/ this]] strip.
--> And here we have the labyrinth guards. One always lies, one always tells the truth, and one stabs people who ask tricky questions.
** Lampshaded [[http://xkcd.com/370/ here]].
* The [[Webcomic/TheOrderOfTheStick Order of the Stick]] encounters the classic "[[KnightsAndKnaves one guard always lies, one guard always tells the truth]]" puzzle on the way to the Oracle of the Sunken Valley in [[http://www.giantitp.com/comics/oots0327.html this strip]]. Haley proves how smart she is by [[CuttingTheKnot shooting one of the guards in the foot]], and determining their nature by their reactions. It's outright defied when Haley [[http://www.giantitp.com/comics/oots0565.html returns to the Sunken Valley]]: the guards seem to remember her, while she doesn't remember them (due to the [[LaserGuidedAmnesia memory charm]] put there by the Oracle).
%%* [[http://partiallyclips.com/2002/09/11/paradox-dragon/ Paradox Dragon]] strip of Partially Clips.
* Subverted in [[http://drmcninja.com/page.php?pageNum=26&issue=14 two]] [[http://drmcninja.com/page.php?pageNum=27&issue=14 strips]] of ''Webcomic/TheAdventuresOfDrMcNinja''. Turns out, it's [[spoiler:not Only Smart People May Pass, it's "Nobody may pass but we were too cheap to get a motion detector or a door." It could also be interperted as "No Inocktek may pass", so you're better off not understanding the ancient inscription at all.]]
-->'''AltText:''' Zelda, I dare you to make a game without [[HollywoodTorches this]] [[SolveTheSoupCans puzzle]] in it.
* ''Webcomic/SluggyFreelance'': One of the tests that must be passed to enter the Cave of Yffi (in "The Strombreaker Saga") is a "test of intelligence" that takes the form of a somewhat silly riddle. The heroes make it past by arguing their different answers were all as good as the "right" one. The gatekeeper then tries to make the riddle so specific that it can only be answered the one way ("a bat with lesions"). The villain nevertheless manages to answer it with "a nun with a spear through her head".
* ''Webcomic/{{Goblins}}'': These kinds of puzzles are mandatory in any dungeon crawl . Sometimes there is a straight but not always obvious solution, other times the heroes need to TakeAThirdOption.
** In [[http://www.goblinscomic.com/tempts-fate-5/ Tempts Fate 5]] Tempts runs across a sentient door asking him a riddle. An incorrect answer will spell certain doom. [[TakeAThirdOption So Tempts just opens the door without answering and walks on through.]]
** In [[http://www.goblinscomic.org/tempts-fate-7/ Tempts Fate 7]] there is a series of such puzzles that were needed to be solved by the readers before Tempts could pass them. While all the puzzles were solved, Tempts [[TakeAThirdOption took a third option]] on one of them anyway. [[http://www.goblinscomic.org/tempts-fate-10/ Tempts Fate 10]] is similar.
** There is a relatively simple one [[http://www.goblinscomic.org/06152010/ here]], but K'seliss is just dumb enough not to get it.
** A classic example can be seen [[http://www.goblinscomic.org/12222013/ here]]. [[spoiler: You have to pull out the tree block, and the real key to the door is literally under it.]]
* In ''Webcomic/RustyAndCo'', [[http://rustyandco.com/comic/level-6-35/ Madeline and Rusty hit one that probably would not have been a problem for any character except those two.]]
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/VeggieTales'' did an AffectionateParody of ''Film/TheLordOfTheRings'', which has a scene similar to the Gates of Moria. As the show is for kids the riddle is quite easy. The answer is [[spoiler:an elephant.]]
* The ''WesternAnimation/PhineasAndFerb'' KingArthur-slash-''Film/ThePrincessBride''-slash-''Lord of the Rings'' episode "Excaliferb" has Professor Poofenplotz as a bridge-guarding troll who demands that the answers to three questions must be given correctly in haiku form in order to pass. [[IdenticalGrandson Baljeetolas]] notices that the creek is shallow, and the questers go around the bridge. Later in the episode, [[IdenticalGrandson Candavere]] approaches the bridge having transformed into a [[HybridMonster uniwhalescorpiopegasquidicorn...]] [[ItMakesSenseInContext girl]]. Poofenplotz lets her pass out of fear.
[[/folder]]

[[folder:Real Life]]
* High IQ Societies, like MENSA, require an IQ of at least 130 to join.
* This is the point of the [[http://en.wikipedia.org/wiki/Microsoft_interview technical interview]] for information technology jobs. The interviewers will give you programming-related logic puzzles to solve and they consider how you attempt to solve these relatively basic problems to assess how well you might handle more complex coding work. This has changed as time as passed. A lot of the "standard" questions have been spoiled by now, so it's effectively becomes a test whether you're clever enough to use Google to prepare beforehand or not. In a lot of real world situations, reinventing the wheel is a ''bad'' thing. Figuring out that someone else has probably already solved the problem and finding and using their solution is likely to be a lot faster than working it out yourself, making it a decent screening test again, if not for the reason the interviewer intends.
* Academics naturally has a lot of these. The purpose of an exam is to prove that you are smart enough to advance to the next level.
** Graduate school oral exams (and, to a lesser extent, the dissertation defense) are this since the committee can, theoretically, ask you ''anything'' related to the subject in question.
** Standardized testing for law school often includes logic problems that challenge the applicants' ability to reason out evidence and follow deductive trains of thought.
** Doing well on the MCAT (Medical Colleges Admission's Test) in the United States requires both extensive knowledge of biology, physics, chemistry, and organic chemistry as well as excellent reasoning, reading, and composition skills. Everyone taking the exam has a college degree, most of them in biology or chemistry, and had to do very well to bother taking the exam. Two-thirds of the test-takers ''will not'' get into med school.
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