Yes, Score Predictor is completely free to join and play.
Yes, you can update your prediction any time before the match kicks off. Once a match starts, predictions are locked.
Leaderboards are updated automatically after each match result is entered.
Predictions for postponed matches remain saved and will be scored once the match is played.
Go to Leagues from your dashboard and enter an invite code shared by the league creator, or ask someone to share their league link.
Yes, you can join as many leagues as you like.