Prize Balls are a type of basketball in NBA 2K23’s MyTEAM that give various rewards (e.g. a MT pack, tokens, etc.) if you play games with them. The prize balls will start to crack open little by little and eventually open up and give a reward, but you lose the ball.
For the Holiday Season, 2K is giving away free Prize Balls in NBA 2K23 MyTEAM if you login to the game mode daily, up until the day after Christmas.