Who will be crowned the winner in the Grand Final tonight? The top two will need to call on every skill they've mastered in the competition, every lesson learnt to survive the Ultimate Zumbo Test.

This episodes sweet sensations task has been seriously up-sized. They'll have to go big or go home.

The contestants must create the ultimate kids party cake. Adriano Zumbo and Rachel Khoo won't be the only judges; they've called in some tough critics - kids!

The dessert makers must conjure up a creation that defies gravity in their toughest challenge yet. Who will pull off the impossible, and who will come crashing back down to earth?

Using chocolate, the remaining dessert makers must produce their most swoon-worthy creation. The two weakest will head straight to the Zumbo Test, where a truly monumental challenge awaits them.

A golden surprise is in store for the remaining contestants.

The Sweet Sensations task is all about 'Franken desserts', where contestants must take existing desserts and fuse them together to create a brand new creation.

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Australia's most celebrated patissier Adriano Zumbo will put twelve of the country's most passionate dessert makers to the test on Zumbo's Just Desserts. They will be joined by Rachel Khoo.

The remaining dessert makers must take their favourite Arnott's biscuit and turn it into an amazing new dessert. One dessert maker suffers an epic meltdown as the heat rises in the kitchen.

For this Sweet Sensations task, they have to demonstrate their burning passion by creating a dessert inspired by fire. Who will capture the drama of fire and set the judges' worlds alight?

The remaining dessert makers must tap into their natural talent. To make it to the end, they'll not only need to draw on everything they've learned but also trust their natural instincts.

The judges ask 10 new cooks for dazzling desserts that are hiding a secret. Later, the bottom two must make a whimsical "I'm Not Lion" cake.

The next task is a tall order: edible towers that are at least 2 feet high. The two cooks who don't measure up must make Zumbo's "Lucky 13" cake.

The competition heats up with different takes on the ultimate ice cream sundae. Then it's on to Zumbo's "lazy" version ... which is anything but.

An out-of-this-world challenge sends the cooks' creativity sky-high. But a Zumbo Test of sobering difficulty brings two of them back down to earth.

Kids take over the Dessert Factory for a colorful party-cake challenge. But the fun's over when Zumbo reveals a fruity test fraught with peril.

A dessert challenge with a timed bonus keeps the competitors on their toes. Later, the lowest scorers must make a layered cake -- a clock on a rock.

The contestants' sweet creations take a dark turn with desserts that scream "fright night." And if they fail? A terrifying Zumbo Test awaits.

It’s a fight to the finish -- with smoke and mirrors -- as three hungry dessert makers compete for a golden ticket to the finals.

Tension grows in a semifinal round of garden-inspired sweets, with two cooks duking it out for the remaining spot in the grand finale.

With their dessert dreams on the line, the finalists are ready to compete. But this time, the Zumbo Test comes first -- and it’s a doozy.