Around 120 children from St Agnes Primary School are taking part in the weekly challenges to build the tallest tower, a moving vehicle and a weight bearing bridge with Lego.

The competition is mirroring 2017 British reality show and 2019 Australian television show, LEGO MASTERS.

Those programs showcase teams of two who compete to build structures from a stockpile of 2.5 million Lego pieces for a $100,000 prize.

STEM, science and technology leader Daniella O'Brien said there was a more modest $1 canteen voucher on the line at school but students were still competitive.

"The challenges are part of developing creative and critical thinking," she said.

"The students are testing their engineering skills, problem solving as well as fine motor skills assembling the Lego.

"Students must also work with a partner, working collaboratively in a team for 40 minutes the same as LEGO MASTERS."

The Lego sessions are split into three days with students from years three and four building on Monday, kindergarten, years one and two on Tuesday and year five or six on Fridays.

Rafferty Gordon, 9, Quinn Hancock, 10, and Eddie Gleeson, 9, were one of the teams to take part in the tallest tower challenge.

They said there were a few tricks to creating a tall structure.

"We had to connect another block to the side, otherwise it would just fall over," they said.

"The tower needs to be stable but thick and not too heavy."

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