Press the Rankings button in Rhee’s window and select the rating you’re interested in for a certain difficulty level. The results are posted at the end of every day, and players in the top places are rewarded with special prizes. All other participants also receive various bonuses.
For each treat she receives, Rhee awards players some generosity points. Rare desserts score more points. Players that fed Rhee the most exquisite desserts, end up at the top of the Most Generous Contestants ratings.
Players whose treats Rhee eats last score luck points. This takes some skill to get used to. Players with the most luck points are at the top of the Luckiest Contestant ratings.
To collect a reward, open the ranking window after the end of the ranking day. There you’ll see a window with information about your prize.