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Summer Adventure is a series of ??? quests in Kingdom Hearts Unchained χ / Union χ, in which The Player and friends spend their summer going on an adventure. In the English version, it was available from August 1 to 31, 2018. From August 1 to 10, new quests were added every day.
On August 11, 2018, a Proud Mode version of the Summer Adventure was released. Like Proud Mode, these quests required a specific Keyblade, and had a condition for using Special Attacks. In these quests, all objectives needed to be completed at the same time.