15 round format (old)

The 15 round format was introduced as the show's length increased from a 30 minute to 45 minute slot with Series 46.

Whereas previously contestants picked the same number of letters and numbers rounds, this was no longer the case with the introduction of the new format. The champion picks 1 numbers game and 6 letters games, with the challenger picking 2 numbers games and 5 letters games, including a potentially crucial last numbers game.

For games where there are no reigning champion, or finals games, order of play is decided by an off-screen coin toss - the winner gets to choose whether to pick as 'champion' or 'challenger'.

Champion picks in odd-numbered rounds, challenger in even-numbered rounds. Letters game = L, numbers round = N, Conundrum = C:

Round 1: L

Round 2: L

Round 3: L

Round 4: L

Round 5: N

Celebrity anecdote + ad break

Round 6: L

Round 7: L

Round 8: L

Round 9: L

Round 10: N

Ad break.

Round 11: L

Round 12: L

Round 13: L

Round 14: N

Round 15: C