Callum, Joanne, Peter and Skye faced off in the Pressure Test; to recreate George Calombaris' oyster terrine. Callum's terrine was described as a dog's breakfast but was closest to George's dish in flavour.

Callum, Matthew and Sharnee faced off in the Pressure Test, where they had to recreate a Beef Stroganoff with Parsley Fettuccine without a recipe to follow. Each of the contestants identified the correct meat, but each contestant's dish had flaws; Callum's Stroganoff lacked enough sauce and his pasta was overcooked, Matthew put too much tomato paste in his Stroganoff and Sharnee incorrectly used nutmeg instead of paprika.

Vegetarian theme. In a meaty Mystery Box challenge, it was Claire who managed to impress the most and was given a significant advantage in the Invention Test, which would be contested in pairs. As well as picking the core ingredient, Claire was given the power to choose the pairs for the challenge. In a further twist, they would be cooking to impress six staunch meat-eaters, and the two judges, with their vegetarian meals. Aaron and Adam emerged as winners with their curry, and won the chance to face off in a mystery challenge for immunity.

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In a twist on the traditional format, Aaron and Adam competed against each other to win immunity. They had 1hr 45min to complete three dishes with three core ingredients for three Celebrity Chefs, Matt Moran, Kylie Kwong and Ian Curley. The Chefs would then pick their favourite of the two dishes, and the contestant with the most votes would win immunity.

Teams were tasked with creating a dining experience using principles of molecular gastronomy. With the help of two leaders in innovative cooking, each team was tasked with a specific theme to shape their dining experience.

In a two-round Elimination Challenge testing basic skills, members of the Blue Team were first asked to cook Chicken Korma. They were provided with all the ingredients but were left to choose which spices to use. Out of the six contestants, only Alvin's attempt was of an acceptable quality with Jonathan and Skye the worst of the rest. They were sent into a sudden death challenge to name spices.

"Australian Food Icon" theme. The winner of Masterchef Australia 2009, Julie Goodwin, returned as a guest judge for the Mystery Box Challenge, the ingredients of which were also chosen by her. Marion won the challenge and she chose Chiko Rolls as the food icon contestants had to "re-invent". Jonathan's dish was the most impressive while Callum, Matthew and Sharnee were chosen as the Bottom 3 contestants.

The remaining contestants were asked to prepare their signature dish. In a first for MasterChef Australia the contestants did the judging, with the men voting for their favourite dish from the women, and vice versa. The top 7 vote-getters (4 women, 3 men) were then put into a beef wellington pressure test, with the best man and woman progressing directly to the top 24. The winners, Claire and Jimmy, were the first pair to advance to the Top 24.

The 10 contestants who performed worst in Tuesday's signature dish challenge were split into 5 groups of 2 and given 7 hours to drive out to local farms, collect fresh produce, and return to the MasterChef kitchen to prepare a main and a dessert. One contestant, Andrea, found the challenge difficult, and realised that MasterChef was not for her; her withdrawal from the competition forced her partner in the challenge, Philip, to prepare both dishes on his own. Despite this setback, he and 4 others kept their spots in the competition, while 5 contestants were eliminated.

With 10 spots in the Top 24 on the line, the remaining contestants competed in a mise en place challenge. The challenge had 4 stages, with the worst performers in each stage removed by Gary and George. The first stage involved separating egg yolks and whites. The second asked the contestants to julienne carrots. In the third, the first 10 contestants to shuck 12 oysters satisfactorily moved onto the final stage, wherein Marion, Adele, Courtney and Daniel successfully cut 6 fillets of salmon weighing between 170g and 190g first, gaining their places in the Top 24. Following the mise en place challenge, the remaining contestants had to follow a recipe from Matt Moran, with poor performers gradually eliminated in stages. 10 contestants had their dishes tasted, with Jonathan, Peter, Aaron, Adam, Kate B. and Philip impressing the judges the most, winning their spots in the Top 24.

After a mystery box challenge, 4 contestants will be through to the Top 24, and 4 will be sent home. The contestants cook a Neil Perry fish dish in a pressure test and Neil also judges the dishes.

The off site team challenge, to take over the running of two Italian restaurants, saw the Red Team conquer despite having a simpler menu. From the Blue Team, Jonathan and Devon were selected by the judges as the two worst performers and were up for elimination. Sarah withdrew from the competition to return to her family.

In an unprecedented twist, Callum as winner of the weeks Invention Test was granted the power to pick his entire team first. The off site challenge was to put on a children's birthday party for 150 people, who would vote for their favourite dish. The Blue Team proved to have too great an advantage and won easily.

As the Blue Team enjoyed their reward at Sails on Lavender Bay with Nathan Darling, Jonathan and Adele faced off in a "fix the dish" challenge. They had to fix a poorly made dish (a bolognese sauce) in ten steps, each step adding their choice of a range of ingredients.

Indian theme. The Mystery Box challenge saw the contestants choosing between a main and a dessert, with Skye's Crispy Duck winning her the challenge and picking goat as key ingredient in the Invention Test. Jimmy was the favourite to win but in the end it was Jonathan whose invention impressed the judges the most.

The two teams were tasked with preparing a Classic French 3-course meal for Matt Preston, Tetsuya Wakuda and Guillaume Brahimi. Michel Roux mentored the Red Team, Tony Bilson mentored the Blue Team.

"Modern Australia" theme. There was no Mystery Box challenge this week, instead the contestants faced a pizza making challenge. Fiona was the victor and picked tropical fruit as the Invention Test's core ingredient. Many struggled with this sweet choice, while Marion's risky recipe paid off and she was declared the winner.

Jake, Jimmy and Matthew faced off in the Pressure Test; to recreate a Rick Stein seafood platter worth $350.

The top 50 began with a barbecue challenge, with the freedom to cook whatever they wanted. The 10 worst performers were sent into a pavlova pressure test led by Donna Hay. The 5 contestants who produced the worst pavlovas were eliminated from the competition.

Shaun Presland shows how simple Japanese is.

The two teams were faced with their toughest challenge yet: to take over the running of George Calombaris' own restaurant The Press Club on its relaunch, serving a variety of Australian food royalty and celebrities. Each team struggled early with the stresses of running a restaurant.

The Top 24 arrived at the MasterChef house and then headed to the MasterChef kitchen. The contestants had 90 minutes to create a dish that was a childhood memory for them. The winner will now cook off against a celebrity chef and if they win, will be given an immunity prize, which can be uses to escape an elimination if need be.

Japanese theme. The Mystery Box challenge saw the contestants making the "perfect burger", with only five selected to taste by the judges. Marion won the challenge and picked tuna as the core ingredient for the Invention Test. With a Japanese theme, Adam was favourite to win the challenge but it was Callum who triumphed.

Carrie, Kate and Fiona faced off in the Pressure Test after cooking the three least impressive dishes in the Invention Test. They were asked to replicate a chicken dish from chef Peter Gilmore. Fiona had a slow start but she finished strongly and cooked the chicken perfectly but her dish lacked detail. Despite a strong start, Kate failed to read her recipe thoroughly, she wrapped up her chicken too much that it didn't cook properly and she ended up serving the judges raw chicken although her vegetables were perfectly cooked. Carrie struggled through the whole challenge, she cooked the chicken perfectly but all the flavour leaked out in the water bath because she left a hole in her chicken's skin and her vegetables were undercooked.