Cityprom held its Lego Building Competition judging day in the Brisbane Street Mall yesterday.

Almost 20, five to 16-year-olds entered the school holiday competition.

Cityprom promotions officer Kristy O'Byrne said entrants had a week to put together their displays before they were put on show for public judging.

Two winners took home a $200 Birchalls gift voucher.

Oliver Christmas won the five to 11-year-old category and Kahlia Monk-Morcom took out the 12 to 16-year-old section.

Brothers Noah Baker-Dowdell, 8, and Ethan Baker-Dowdell, 5, both of Trevallyn, were two of about 500 people to vote yesterday.

Ethan said his favourite was number 12.

``It looks like the Lego movie,'' he said.

He said he loved Lego.

``We've got about a million pieces.''