A:Answer4 players are supported on Mario Tennis Aces! However, online play is restricted to 2, but you can still play as a doubles team with a local friend against online opponents.
A:AnswerI have never seen a digital version cheaper than a hard copy used. Best thing about a used hard copy, you can return it, give it away, sell it, or use for a target. Digital, if you don't like the game, it's yours forever.