Only Connect has been dubbed as the 'most difficult quiz on TV' and its hardest ever questions have been revealed - but how many can you answer correctly? The BBC show first broadcast in 2008 and consists of a tournament-type format in which teams compete by finding connections between seemingly unrelated clues. It is presented by Victoria Coren Mitchell, 52, and has so far seen over 500 episodes spanning across 20 series. Naturally, there have been countless questions on the show that have left both fans and contestants alike baffled. And the show was recently named one of the most difficult quiz programmes on television, in a survey part of Spin Genie AR's Treasure Quest launch. Here are ten of the trickiest questions seen on Only Connect so far: 1. What is the connection? Beethoven's 7th Centre of Gravity 3rd of November Very beginning 2. What connects these famous people? Julian Clary George Elliot/ Dick Van Dyke Anne Hathaway Timmy Mallet 3. What connects these four things? The Rio Olympic diving pool Oxidised paper 17th century carrots An embarrassed person 4. What links these four clues? 'Grindelwald is the younger of the two main characters' 'Fleur Delacour dates Grindelwald' 'Mad-Eye Moody is the older of the main characters' 'Lord Voldermort is the boss of Grindelwald and Mad-Eye Moody' 5. Can you spot the connection between these phrases? 6. What connects these English counties? 3 in Cambridgeshire 2 in Staffordshire 1 in Hertfordshire 0 in Dorset 7. What is the connection that links this sequence? Anapest = U Trochee = N 8. What is the connection from this missing vowels round? BGB GBGB GBG PTTN GPTT NGPT TNGPT TNGP TTNG MSS SMS SSM SS SMS SSM SSS LS TL ST LST LS TL ST 9. What is the connection in Victoria Coren Mitchell's 'most hated' question? The Wurzles Clarkson's Farm 10. What is the connection? Try (if you see only this), B (if you see also this), Yellow (if you also see this), A loss (if you see this) Only Connect Pelican crossings 1. The position of the letter V in each phrase. 2. They all share their names with Enid Blyton's The Famous Five. 3. They are all colour changes in the order of the rainbow. The pool at the Rio Olympics turned green, oxidised paper changes to yellow, carrots were originally purple before orange ones were grown in the 17th century and an embarrassed person's face turns red. 4. In Bruges. All are Harry Potter actors who also starred in the film In Bruges. Colin Farrell, Clemence Poesy, Brendan Gleeson and Ralph Fiennes. 5. The first letters of each of the phrases spell out QWERTY in French, German, Russian and English. 6. The English counties by the number of cities. Cambridge, Ely, and Peterborough are in Cambridgeshire, Stoke-on-Trent and Lichfield are in Staffordshire and St Albans is in Hertfordshire. While there are no cities in Dorset. 7. Morse code in metric feet. A dactyl is a metric foot that consists of a stressed syllable as well as two unstressed syllables. When translated to morse code it becomes dash dot, dash dot dot. D would be dash dot dot while Anapest becomes U as it is dot dot dash. 8. They are all five words in alphabetical order. BAG BEG BIG BOG BUG / PATTING PETTING PITTING POTTING PUTTING / MASSES MESSES MISSES MOSSES MUSSES and LAST LEST LIST LOST LUST. 9. The Wurzles' song, 'I've Got A Brand New Harvester'. It goes 'I got 20 acres and you got 43, now I got a brand new combine harvester and I'll give you the key.' 10. The scoring system on Only Connect. A Try in rugby scores five, B wins three in Scrabble, yellow is two in snooker while red is one, and you score zero if you read all of the four clues and don't know the answer. Only Connect airs on BBC Two and is available to stream on iPlayer.