Good thing I didn't ask about ghosts. It was one of my possibilities. No ghosts that I'm aware of. (But since they like to hide, you never know.)
Okay, so there is a game, possibly a sport, involved. Is it a game that is normally played in the sand? Not familiar with the game and had to check Wiki - never thought it was that complicated. Looks like normally it would be sand, yes. Seems like dirt would do as well?
Is it volleyball? Football? Frisbee? (I really have my hopes up for volleyball, as that makes sense with the question about sand, but that really seems like a sport to me.) Kite flying? Building sand castles? None of the above. (Sorry about the volleyball, and I would have called that a sport, yes. Looks like Wiki might consider this a "sport.")
Was the anger over the man beating the murderer at the game? It's not known who was beating whom.
Did the murder occur at day? Yes. Night? I doubt it. Is it relevant? From a light perspective, not a time perspective.
Did the game involve something that was used as the murder weapon? Yes.
I keep reading one of your replies: Did they fight each other? Do you mean like boxing or fist fight or karate? If so, no. Could this mean they were competing against each other? They're competing but not a "fight competition."