Sly, Bentley and Murray attempt to recruit Murray's Guru in Australia.
- Arc Villain: The Mask of Dark Earth.
- Artistic License Geography: Australian geography is inaccurate, as both Uluru (referred to as Ayers Rock in-game) and Wave Rock are in Yuendumu, Northern Territory. In reality, Uluru is by the South Australian border, over 600km away from Yuendumu, while Wave Rock is near Hyden, Western Australia, which is nearly 300km away from Perth.
- Colossus Climb: Sly does this to the Mask of Dark Earth-possessed Carmelita in the final boss fight of "Rumble Down Under".
- Evil Mask: The Mask of Dark Earth serves as the main antagonist. When the mask possess someone, they grow bigger and become more aggresive. After its host dies, it will precede to escape by floating away.
- Heavy Voice: When Carmelita is under the effects of the Mask of Dark Earth, her voice gets deeper as she gets larger.
- Land Downunder: The Guru is an aboriginal koala with Dreamtime magic, the miners are all kangaroos and dingos mining for opals, there are crocodiles, visits to scenic Ayers Rock and Wave Rock and most of the music is done in didgeridoos.
- Living MacGuffin: The Guru. Help him drive off the miners and destroy the Mask of Dark Earth and he will join the gang as their Token Wizard.
- Make My Monster Grow: The Mask of Dark Earth does this to anyone it possesses. It even possesses Carmelita, resulting in a boss battle against her.
- Mini-Boss: With the exception of Carmelita, every mook the Mask has possessed counts as this.
- Operation: [Blank]: "Operation: Moon Crash" starts with the Guru using his powers to dispose of the gyro-copter. Murray will pose as the Mask's enemy the Moon Spirit to attract the Mask, who Murray with then Thunderflop into oblivion. With the Mask and its corrupting influence gone, the already on-edge miners will leave, Murray will be free to rejoin the gang, the Guru's life-long task will have ended and he will join the Cooper Gang.
- Sealed Evil in a Can: The Mask of Dark Earth was long-imprisoned in the area before the opal-miners unwittingly unleash it, the Guru having been tasked with making sure such a thing never happens.
- Shown Their Work: In spite of the inaccurate locations of Uluru and Wave Rock mentioned in Artistic License, the map of Australia shown in the opening cutscene is accurate, with the states names and boundaries, capitals, major towns and cities, and highways displayed.