Up to 300 children aged between three- and 14-years-old competed in the heats over Monday to Friday last week, with the winners of the heats coming back for the finals on Saturday.

Wodonga's Mitchell Corkett, 7, took out the top prize for the 3- to 7-year-old competition with his design on the Mosasaurus, a type of a dinosaur.

"It's a type of crocodile, but it doesn't have any legs, it has feet," he said.

"I just looked at the box and it just came to my mind."

Mitchell said he didn't know how he felt when he won, but his huge surprised grin suggested he was proud of his achievements.

"Last time I came first place and I came first place again," he said.

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"I'm just glad that I did that."

Coming in second place for the same age category was Hannah Mancer, 7.

"I built a school," she said.

"These are the lockers, this is a white board, these are like desks and this is a door to get into the classroom."

In third place was Wodonga's Tate Duncan, also 7, with his design of a Lego wall structure.

The children had 25 minutes to work with 500 pieces of Lego to create their designs.

Production co-ordinator Simon Griffiths said it was incredibly difficult to choose a winner.

"The way we choose the winner is of course we take into account the age of the builder, the use of colour, how well the bricks are put together and the imagination that's put into their model," he said.

"We've had a great week here at Wodonga Plaza, really enthusiastic kids, very enthusiastic parents, and the response has been fantastic."

Mr Griffiths said the program was about getting kids away from screens and using their imaginations.

He said throughout the week there had been some amazing designs.

"Anything from volcanoes to aeroplanes and spaceships, through to garbage trucks that hover high above the city and reach down and collect the garbage with their mechanical arms," he said.

In the eight to 14 year olds age group Ethan Beaumont, 12, took out the first prize with his clever upside down design of the Titanic ship sinking, Jasper Humphrey, 12, created a a suspended bird feeder to win second place and in third was Isabella Hawking, 10, with a med-evac helicopter dropping a patient off at hospital.

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