Magic
Wizard sport played on brooms. Two teams of seven people each. Houses (Slytherin, Gryffindor, Hufflepuff, Ravenclaw) each had a team in Hogwarts (and there's pro quidditch too, sorta like how muggles have football here). Though.. there aren't that many of us here, let alone 7 of us from our own houses but I guess we'll find a solution for that too. Myself, I'd hope that having games include people not just from my world would increase the numbers quite a bit.
Anyway... yes, we play it on brooms. Chasers have to toss the Quaffle ball into one of three hoops. Ten points each time. There's bludgers too. Nasty balls, minds of their own, really nasty ornery things. Or charmed that way at least. Beaters hit it with their clubs to keep it away from their team, and also to make them go to their opposing team. Don't wanna mess with a bludger, it's really b One Keeper guards the opposing goal post. Oh! Seekers. One each team. They catch the Golden Snitch, small gold ball with wings, and fast, unpredictable. Interesting history on that, btw, used to be a snidget bird during barbaric time in the 1400s, and so became endangered after a lot of games. Then someone came up with the Golden Snitch idea. So now, a team Seeker catches it, and it's 150 points. That also ends the whole game too.