of all ages crowded the barricades trying to get a glimpse of MrBeast.
The 26-year-old holds the record for the most subscribed channel on YouTube with 289 million followers.
He specialises in high-production videos of elaborate mental and physical challenges in which everyday attempt to win large cash prizes.
Some of his biggest videos include a real-life recreation of Netflix's Squid Game, being buried alive and a challenge involving sitting in a bathtub full of snakes.
He also runs a philanthropic organisation called Beast Philanthropy and videos many of his charitable acts.
Many of his videos have hundreds of millions of views, and it is estimated his channel gains 5 million subscribers each week.
Forbes magazine estimates his net worth to be $750 million.
Born James Donaldson, MrBeast grew up mainly in Kansas and North Carolina in the US with his parents working in the military.
He began creating YouTube videos with friends after dropping out of university, eventually employing his friends as his popularity grew.
"There's a five-year point in my life where I was just relentlessly, unhealthily obsessed with studying virality, studying the YouTube algorithm," he told Rolling Stone in 2022.
He began posting YouTube videos as a teenager, mainly filming himself playing video games.
MrBeast had a viral breakthrough in 2017 with a video of himself counting to 100,000, and followed that up with several viral challenges and pranks.
Earlier this month, he overtook Indian music video label T-Series as the most popular YouTube channel.
The top spot had previously been held by Swedish creator PewDiePie.
MrBeast organised another one of his signature viral stunts for his Sydney audience at the Opera House forecourt this afternoon.
During his appearance, MrBeast gave away 10 cars to his fans, including a Lamborghini and a Scooby-Doo van.
Contestants played a number of games to win the cars, including throwing a ball through a large board with holes in it.
One woman was asked to choose between a 1993 Volvo which was wrapped in the face of another YouTuber, Lannan Eacott, an Australian known as LazarBeam online.
LazarBeam offered the young woman $50,000 in exchange for the car he claimed was only worth $5,000, but she declined.
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