Happy Rainbow Drop is an S-grade treasure can only be obtained from the limited time Collect Water Drop event, which is no longer available. In order to get this treasure, the player must collect 250 water drop jellies randomly appearing in the game play before the certain amount of time.
Before Season 4 of Cookie Run, this treasure was an A grade and only gave 8-10% XP Bonus. Sudden changes made the treasure's grade into S and boosted 11-14% XP Bonus.
During Season 4 of Cookie Run, this treasure has downgraded back to A grade with the same effect as the original S grade treasure. The image also has changed from a rainbow colored drop to a gingerbread man in a bag.
11-14% XP Bonus
This special drop brings happiness and peace to all the cookies.
The Old statistic represents before Season 4 of Cookie Run, while the New statistic represents the current situation.