Callbreak.com - Card game

How to play Callbreak.com - Card game

Crucially, Curwen sees those efficiencies as a means to an end rather than the primary objective.

“That’s where I think Game in a Box becomes really interesting,” Curwen says. “The ambition isn’t to use technology to make average games faster. It’s to give talented creators the freedom to try more ideas and hopefully produce better games.”

As work on Game in a Box progressed, Yggdrasil began to see an opportunity extending beyond its own production process.

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Still, Kalshi had a nine-fold lead over Polymarket, its next closest rival. Polymarket, meanwhile, led the group with 762,000 app downloads, edging Kalshi, DraftKings and FanDuel in the category. The downloads represented a 13,509% weekly increase and 25% of total category downloads, Polymarket wrote in a statement.

Across the market, operators delivered high double-digit gains compared with Labor Day weekend, which featured a full slate of college football games but no NFL contests. Two operators, DraftKings and Underdog each saw triple-digit growth, delivering weekly increases of 125% and 119%, respectively. Three others, Polymarket, Crypto.com and Novig, saw gains of at least 30%, led by Polymarket with a weekly increase of 46%.

One interesting nugget surrounds weekend figures at Kalshi, where volume on Sunday only surpassed prior daily activity by $34 million, BofA data shows. Typically, Sunday volume for the quarter dwarfs that of College Football Saturdays due to the voracious demand for NFL offerings. BofA analyst Shaun Kelley attributes the irregularity to the possibility that Kalshi is “over indexing” on college sports.

How to play Callbreak.com - Card game

The two related businesses are associated with entrepreneur Nic Brereton and had only recently started operating under their own licences. BresBet was licensed in February 2025, while Bet St George received its licence in December and launched in March this year.

At launch six months ago, Brereton told iGB that Bet St George would use the experience he gained applying advanced data models in the medical sector to improve the customer experience in betting.

“Sometimes what data tells you is uncomfortable because it’s challenging the norm,” he said at the time. “For me [it’s about] where we can make some marginal differences by using player data and challenging the perspectives of what the industry thinks should and does happen.”