[[caption-width-right:350:The ''Countdown'' logo...]][[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/8_out_of_10_cats_does_countdown.jpg]]
[[caption-width-right:350:...and the ''8 Out of 10 Cats Does Countdown'' logo.]]

->"''As the countdown to a brand-new channel ends, a brand-new ''Countdown'' begins.''"
-->-- '''Richard Whiteley'''[='s=] first words on the ''Countdown'' debut, alluding to the show's precursor ''Calendar Countdown'' (which aired as a brief regional series in 1981).

The thinking man's game show, and the face of Creator/Channel4 in Britain, having been the first programme aired on the channel in 1982 and running ever since. Two contestants face off in a series of Letters and Numbers Rounds, each hoping to score more points than the other. Every round is timed to 30 seconds, with a big clock ticking down behind the contestants. It was a companion to ''Series/FifteenToOne'' until that show's demise. It was paired with ''Series/DealOrNoDeal'' for a whole decade, but following that show's demise, Countdown's companion is now a revived ''Fifteen to One''.

''Countdown'' is based on a [[EverythingSoundsSexierInFrench French]] game much more straightforwardly titled ''The Numbers and Letters'' (''Des chiffres et des lettres'').

In January 2012, the stars of the panel comedy show ''Series/EightOutOfTenCats'' did an AffectionateParody of ''Countdown'' for the Channel 4 Mashup event, which mixed one show with another for one night of hilarity. It was titled -- wait for it -- ''8 Out of 10 Cats Does Countdown''. It proved so popular that it eventually became a series in its own right, premiering in July 2013.

The rounds are as follows, with the first two repeated several times:
* '''Letters Round''': Nine random letters are drawn, one at a time, with the player requesting either a vowel or consonant on each draw. Once all the letters are on the board, the players try to form the longest single word they can. Only the longer valid word scores: one point per letter, or 18 for using all nine. Currently played 10 times per episode.
* '''Numbers Round''': The player requests anywhere from zero to four "large numbers" (25, 50, 75, or 100) chosen at random, and enough "small numbers" (two each of 1 through 10) are drawn to give six altogether. A random three-digit number is generated, and the players must use the four basic math operations (addition, subtraction, multiplication, and division) to get as close to it as they can. Only the player closer to the number scores, provided their calculations are correct: 10 points for hitting it exactly, 7 for being 1-5 away, 5 for being 6-10 away. Currently played four times per episode.
* '''Conundrum''': Always played as the final round of each episode. The players are shown a collection of words that total nine letters, and the first to buzz-in and rearrange the letters into a single word scores 10 points. If the scores are tied after this round, additional Conundrums are played until the tie is broken. When the scores differ by 10 points or less going into this round, it is called a "Crucial ''Countdown'' Conundrum."

A "Teatime Teaser" is played for the home audience at each commercial break, in which a set of short words is displayed and the host reads a cryptic clue to a single word that can be anagrammed from them. The solution is given at the start of the next segment. (E.g. SAD MOODY with a clue of "We'll all be sad and moody when this arrives" leads to DOOMSDAY.)

No relation to the 1968 Creator/RobertAltman film, the Australian music show, the American news show ''Series/CountdownWithKeithOlbermann'', or the weekly comic series that was later re-titled ''ComicBook/CountdownToFinalCrisis''.

!!GameShowTropes in use:
* AudienceParticipation: If neither player can solve the Conundrum, the host asks if anyone in the audience has the answer and picks someone to call it out.
* BonusRound: Occasionally seen on ''8 Out Of 10 Cats Does Countdown''. So far, bonus rounds have included a pub quiz, penalty shoot out, and drawing a life model.
* BonusSpace: A variant. Any valid nine-letter word in the Letters Round scores 18 points.
* HomeGame: Several, including a DVD version.
* Personnel:
** GameShowHost: Richard Whiteley is the most well-known.[[note]]He was also a presenter on Yorkshire Television's regional news programme ''Calendar'', earning him the nickname "Twice Nightly Whiteley".[[/note]] He was replaced after his passing by Des Lynam, then Des O'Connor. Jeff Stelling began hosting the show upon the departure of O'Connor. Stelling left the show in 2012, and was replaced with Nick Hewer ([[Series/TheApprentice yes,]] ''[[Series/TheApprentice that]]'' [[Series/TheApprentice Nick Hewer]]). Creator/JimmyCarr naturally hosts ''8 Out of 10 Cats Does Countdown''.
** LovelyAssistant: Primarily Carol Vorderman and Rachel Riley, but the earlier seasons had more of them before Carol took over. [[note]]Carol Vorderman's initial role was just that of checking the working out in the numbers round and providing a solution if the contestants couldn't, carrying the humorous (if slightly sexist-sounding) job title "vital statistician"! (She also shared this role with Linda Barrett in the first two series.) Other hostesses were involved in dealing with the letters and numbers tiles. (They included, at various times: Cathy Hytner, Beverley Isherwood, Karen Loughlin and Lucy Summers.)[[/note]]
** StudioAudience
** Dictionary Corner, made up of a lexicographer (usually Susie Dent[[note]]Originally the role varied between different lexicographers but Susie is now a permanent fixture, with her own "Origins of Words" segment[[/note]]) and a guest who changes each week.
* ThinkMusic: About as iconic in the UK as the ''[[Series/{{Jeopardy}} Final Jeopardy!]]'' music is in America, to the point that people who never even watch the show will start humming it as a hint that you need to hurry up and make a decision). [[http://www.youtube.com/watch?v=i9MytO0O_q0 Have a listen]].
!!This show provides examples of:
* ActuallyPrettyFunny: when [[https://www.youtube.com/watch?v=pfa3MHLLSWI&t=167s this]] occurs, Carol nearly dies laughing.
* AlliterativeName:
** The ''Countdown'' Conundrum. It becomes a "Crucial ''Countdown'' Conundrum" if the players' scores differ by 10 or less.
** The Teatime Teaser that bridges each commercial break.
* AndYourRewardIsClothes: Or, as befits the game, books: the grand prize is a dictionary. Not just any dictionary, though, but the [[{{Doorstopper}} full 23-volume leather-bound complete Oxford English Dictionary]]. It's so huge, it actually causes problems for some winners because it takes up ''so much'' space.
** The winner of series 31, David Acton, refused to accept the leather-bound dictionary because of his strict veganism. He chose to receive the dictionary on CD instead, giving the significant difference in value to charity.
** When a champion loses, the challenger who beat him/her receives a teapot shaped like the show's 30-second time clock.
* ArtificialStupidity: The computer which generates the target numbers during the Numbers Round has a habit of throwing out ludicrously easy ones from time to time, usually requiring only two or three of the six numbers on the board. [[http://www.youtube.com/watch?v=d3I2lafp9LY Here's an example]]. Contestants sometimes try to be clever in these situations, but most of the time this trick backfires and gives the opponent a chance at some easy points.
* BadAssNormal: James Martin, if only for [[http://www.youtube.com/watch?v=pfa3MHLLSWI this Numbers Round]].
** On 16th August 2017, Noel, the defending champion, managed it twice on the same show.
* {{Corpsing}}: Richard Whiteley loses it while telling a [[http://www.youtube.com/watch?v=pFbumvpcvuw joke once]]; amazing how he can even make a bad joke funny.
* CrossOver: Being as iconic as it is, the game has appeared in ''other'' shows as part of some kind of task notably to embarrass Creator/AntAndDec on ''Saturday Night Takeaway'', and as a shopping budget task on ''Series/BigBrother''.
** A more straightforward crossover happened with ''Series/EightOutOfTenCats'' as part of Channel 4's "mash-up" night in 2012. The format proved so popular that it has developed into a series in its own right.
* [[CuteKitten Cute Kittens]]: Jimmy actually brings eight kittens in during one round to distract the contestants. It works, but he also spends the round literally herding cats when they escape from their baskets.
* DidntThinkThisThrough: The [[http://www.youtube.com/watch?v=Qo0lbWhHLys kitten incident]] in one ''Series/EightOutOfTenCats'' crossover episode, lampshaded when they point out that Jimmy didn't think it through.
* EarlyInstallmentWeirdness: the basic format hasn't changed that much since the show started on Channel 4, but there have been some peripheral changes which make watching anniversary repeats a bit strange. For example the existence of several female assistants instead of one (who essentially acts as co-presenter now), the extending of the show from half an hour to three quarters, no Susie Dent as resident lexicographer with her own "origins of words" featurette, no "Teatime Teaser" book-ending the commercial breaks, and (in the first episode) the fact that things did seem a lot more awkward.
** Before Channel 4 there was also an earlier incarnation, ''Calendar Countdown'' which was shown only on Yorkshire Television as an offshoot of regional news programme ''Calendar''. If the pilot (kicking around Website/YouTube somewhere) is anything to go by, the format was a lot different, with rounds not making it into the more famous Channel 4 incarnation and the clock ran for 45 seconds.
* FunWithAcronyms: CECIL is the ''Countdown'' Electronic Computer In Leeds. (Unfortunately, it is now somewhat of a NonIndicativeName, given how the program has since moved from what used to be YTV, to the ex-Granada studio block in Manchester, and most recently to the new [=MediaCityUK=] complex across the river in Salford.)
* GettingCrapPastTheRadar: Any non-capitalized, non-hyphenated single word in the ''Oxford English Dictionary'' is valid in the Letters Round.
** Perhaps the most famous occasion: [[http://www.youtube.com/watch?v=7gBXPUSXGWs A pair of wankers.]] The word has been used by other contestants since.
*** Once, Dictionary Corner found a seven-letter word, FUCHSIA. Guess what word is [[PrecisionFStrike right below it in the dictionary]]?
** True up to a point - if a really offensive word comes up, they'll redo it. (The "pair of wankers" clip was an out-take, for instance).
** Or some of peoples' looks. The panelists during this exchange...
-->'''Richard Whiteley''': "And what's yours, Kate?"
-->'''Kate Ogilvie''': "Erection."
-->'''Richard''': "Erection.... Don't do this to me please, Kate. I don't want to be on any more [[HilariousOuttakes late-night blooper shows]]!"
** The word ''VOETSAAK'' was once admitted as valid. The reasoning is that this is a colloquial Afrikaans expression accepted into South African English, and is therefore to be found in English dictionaries. It was defined as a familar expression, inviting somebody to go away or to buzz off. Which is [[PrecisionFStrike on the way to being an accurate definition]].
* GoldenSnitch: Invoked in one of the ''Series/EightOutOfTenCats Does Countdown'' editions, where the team of Bob Mortimer and Lee Mack (trailing 54-0) seemingly arbitrarily persuade host Jimmy Carr (with some help from Joe Wilkinson) to make the final conundrum worth 100 points. [[spoiler:They still manage to lose the conundrum anyway.]] Similarly, just because Jon Richardson wanted to finish a show with the most points of any Countdown player ever, Jimmy made the conundrum of one episode worth over 800 points (the difference between his lifetime total and that of the all-time leader).
* HotterAndSexier: The ''Series/EightOutOfTenCats'' version naturally features much more ribald humour and uncensored profanity.
* LuckBasedMission: Even with the Scrabble-like distribution of letters, forming long words can be tricky. Likewise, not all Numbers Rounds have an exact solution.
* MeaningfulName: Two people named Des have hosted the show, and there are two 'Des' in the title of the original French show, ''Des Chiffres et Des Lettres''.
* PungeonMaster: Richard Whiteley.
* RunningGag: On the ''8 Out of 10 Cats'' edition, Nick Helm's [[StalkerWithACrush frighteningly aggressive]] crush on Susie Dent.
* SeriousBusiness: If the two players are within 10 points of each other for the final Conundrum, it becomes a Crucial ''Countdown'' Conundrum, and the lights dim to emphasize.
* ShipTease: Considering how much Richard and Carol seemed to get along on-air, this isn't surprising. To a lesser extent, Des O' and Carol.
* SignificantAnagram: Words score one point per letter in the Letters Round, or 18 points for using all nine, and the Conundrum (always a nine-letter anagram) is worth 10.
* TakeThat: When Preston North End got relegated from the Championship, a producer who was a Blackpool fan assembled the Conundrum "[[http://www.guardian.co.uk/football/2011/may/12/blackpool-fans-mock-preston-countdown PNECRISIS]]".
* TimedMission: All rounds last 30 seconds.