I was playing an old NES game called Basewars and thought, “This would be awesome as an online programming game!” which lead me to check out what programming games were available online and inevitably to this site 
For those unfamiliar with the game, it’s basically baseball with robots. When a team wins a game, they get a bit of cash to spend on upgrades for their individual team members to make them hit harder, catch better, move faster, etc.
While it would be a bit more advanced than the usual sorts of programming games… would be really neat to see some based on sports like this and not just the usual arena type stuff.