Double Bonus XP is a special type of Bonus that is only available during special weekends for famous holidays.
Bonus XP

A Double Bonus XP was available during the Fourth of July weekend!

Usually, these can last between 3-4 days; during this Bonus Week, all battles from Standard Battle, Challenge Mode, Online Battle, and Survivor Mode will gain Double the XP earned compared to a regular day for your character.

Also noted, currently, characters that are equipped with the Riddler's Staff will noticeably gain the extra X% of XP as mentioned in its effect, whereas during regular days the gear's effect will not gain any as mentioned.

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