Official betting is the name of the game as states and sports leagues make wagering legal. This is a story about how it’s changing the way we watch games and how some of the world’s biggest betting companies are embracing this opportunity.

In just a few short years since the Supreme Court cleared the way for sports gambling, it has become a widespread practice in many US states. Across the country, fans can place bets on anything from which team will score the first touchdown to how many points will be scored in a given game. Bettors can also place parlays, or multiple bets linked together for a higher payout. And for the most avid fans, there are prop bets — or proposition bets — that don’t even relate to what happens on the field.

The NFL and MLB were among the first to embrace sports betting, forming partnerships with DraftKings, FanDuel, and Caesars Entertainment. Other major sports leagues haven’t gone that far, though the NHL did sign a deal this year to make both DraftKings and FanDuel its co-official sports betting partners. The partnership gives the NHL exclusive access to its data for use in betting apps and other content platforms.

But some states are still blocked from sports betting — including Missouri. When Brett Koenig wants to bet on a game from his suburban St. Louis home, he has to drive 45 minutes into Illinois. From mid-June to mid-December, technology firm GeoComply Solutions processed 13.5 million location checks of devices attempting to access sports betting sites. The vast majority of those were in Missouri, with the rest split almost evenly between Kansas and Illinois.