Furthermore, from the first to sixth live show the judges decided which act had to leave the X Factor.

Auditions in front of the judges for series 2 took place in Cologne, Berlin, Munich and Hamburg.

The judges then went on to cut over 80 acts, but called some soloists back, who were asked if they were interested in forming groups.

Then eight groups of each category were built and they fought in a battle, only one act of each duet came into the next round.

Judges' houses, the final part of the selection process, was filmed in the summer 2011.

Mimi Müller-Westernhagen assisted Brönner in Edinburgh, Connor was accompanied by Jason Derulo in Berlin, and Das Bo received help from Melanie C in Hamburg.