Games last for 10 minutes and teams play five games against each other. Winners are determined by the number of kills they get - averaging between 25-45 a game.
Winning in Brisbane would be a major step on the road to one of the world's biggest Call of Duty competitions, the MLG COD Championships, held in Los Angeles in October with a main prize of $US250,000. Teams are accepted on a points system earned through tournaments.
For the Brisbane competition, 19-year-old Rotorua student Nathan Munro-Ireland says the foursome - also including Auckland-based 19-year-old Ryan Wallath and 16-year-old Jack Richards - have been training up to 11 hours a day over the past month.
They'll spend six hours a day playing together, then five more on their own.
Worthington, a student also aged 19, says he's become an excellent "multi-tasker," cramming in study and two jobs around his gaming time.
Overseas, the world's best Call of Duty players earn a living from just playing the game, winning competitions, building a following through their social media channels, live streaming their games and earning sponsorships. Some competitions have prize money of up to US$1 million.
That's just a dream in New Zealand, says Munro-Ireland, but it's one they're hoping they can make come true. He says an average win from a New Zealand Call of Duty competition is about $200 - but they'll share in about $3500 of earnings if they win this weekend in Brisbane.
"It's more like a hobby that we're really into at the moment," he says. "My parents started accepting it when my flights were getting paid for."
* For more information and to follow Uproar.Ignition's progress over the weekend, head to www.uproarnation.com.
