Mayo or Schofield asks a question with a numerical answer, and the contestant who keys it in first in the fastest time advances to the next round.

Any home viewers who can form their own telephone number from these digits (in any order as always mentioned by Simon & Phillip) may call in for a chance to appear on the next episode.

The host gives the champion 15 seconds to study the answers, after which the questions begin and the clock starts to run.

During Schofield's first series as host, the champion then played the Wonderwall again (on the same day as the Wednesday Lotto draw), but with no pit stops, each correct answer awarded £200 with a bonus of £1,000 for getting all 20, for a potential maximum of £5,000.

The prize for giving only one correct answer was a stay at a bed-and-breakfast near the Gravelly Hill Interchange, popularly referred to as "Spaghetti Junction."

During the third series in 2001, the winner of each edition of Saturday's show had to return on Wednesday to play the Wonderwall again for a chance to win some spending money to take on their holidays.

In Italy, between 2000 and 2001, the end-game "The Wonderwall" was played as a segment of Domenica in on Rai Uno and presented by Carlo Conti.