There are others that would be on the list if they were on YouTube, but I think this lot gives you a good glimpse into the world of game show parody.
6) Night School Hi-Q – SCTV
5) The Lillian Verner Game Show – Mad TV
4) University Challenge – The Young Ones
3) World Forum – Monty Python’s Flying Circus
2) Wordwang – That Mitchell And Webb Look
1) Feelyat – Kids in the Hall