The contest designed to push the imagination and creativity of Australia's best LEGO builders returns for a third season, and this season promises to take the competition to a whole new level. Up for grabs is the all new Platinum Brick which will give the winning team immunity from an elimination. To win it, they face a massive first challenge. Teams must create a show stopping piece that will stop a train in its tracks. They have 17 hours to complete their builds.

All eight teams are playing for immunity from the elimination build. They are asked to create a beautiful castle that will spectacularly explode as a bowling ball is hurled at it.

In the first elimination of the competition, teams will have 10 hours to build a world inside a snow globe.

In the first of two challenges, teams are tasked with creating an entirely new creature by blending the DNA of two existing animals.

Teams have 12 hours to create a build that explores the theme of the 'hero's quest'. Adventure, danger, high stakes, precious treasure and a huge journey - even a bit of magic and mystery. It's all part of the hero's quest.

The return of a classic challenge: Cut In Half! Teams choose from a range of items that have been cut in half. Their challenge is to use their imagination in creating the other half of the object from Lego.

Teams must build something that floats, suspended from their very own hot air balloon, for a minimum of 10 seconds.

Our teams battle it out in a double elimination challenge. Four giant base plates representing summer, autumn, winter and spring will come together to show the four seasons. Teams will have eight hours to create one of the seasons.

Teams are tasked with creating their very own arcade game out of Lego.

In the first of two challenges, teams are required to build a vehicle that can race down a purpose-built track in the shortest time possible. In the second challenge, they are tasked with building their ultimate dream home.

In a celebration of the Marvel cinematic universe, teams will have access to an exclusive Brick Pit and collection of Mini Fig characters for a build that needs to show a heroic moment of impact.

In this challenge, each team is provided with a greyscale house. The challenge is to bring their house to life with colour. The build with the least impressive story and aesthetics will go home.

In the penultimate episode, the four remaining teams are required to dress an empty tree branch that is connected to a life-size LEGO tree.

Three teams battle it out in a 28-hour grand finale challenge as they strive to be crowned LEGO Masters and claim the $100,000 prize.