I want my game to have a daily "tournament" that is basically just a leaderboard that resets at midnight each day, and the players with the top 3 scores in the leaderboard are awarded virtual goods as prizes. I assume this is possible, but I'm not sure how to go about it ? Should I be reading the Leaderboards, Challenges or Tournaments tutorials to figure this out ? Any advise on how to implement this would be appreciated.

I have similar "design" problem. I must prepare daily quests. Game server must calculate score at the end of day and set score for every participant to avoid cheating. Sadly I have no idea if something like that is even possible to not exceed platform limits... Can I use leaderboard to something like that or I should prepare my own leaderboard implementation?