Every player in-game represents the UserGame class.
How to create a new instance of UserGame?
UserGame userGame = new UserGameImpl(player.getUniqueId());
UserGame methods:
int getPoints(); //Gets user's points
int addPoints(int points); //Adds points
int removePoints(int points); //Removes points
void setPoints(int points); //Sets points
boolean isPlaying(); //Checks when player is playing
void setPlaying(boolean playing); //Sets playing status
boolean hasPoints(int points); //Check how many coins the player has.