Game Center’s leaderboards are generally used for high-score tracking, such as tracking a user’s highest score in a game and comparing it to other users’ highest scores. However, what if I had a game where if a player won, their skillLevel went up, and if they lost, their skillLevel went down (for the purpose of matching up users with other users of the same skill level)? Would Game Center’s leaderboards be able to support this, or are they strictly built for having scores increase but not decrease?
Game Center’s leaderboards are generally used for high-score tracking, such as tracking a user’s
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You cannot delete a high score.
As explained here – You need to send them an email to report cheating in scores for scores to be deleted. Its on page 3 of GameCenter guide PDF.
As a general opinion in game design, giving a system like this, can discourage the players from playing your game again and again in fear of losing their previous scores/accomplishments.