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If you are playing on a PC, you probably need to open your game manager and download the MC update it shows. It takes less than a minute. Then, when you launch your game, it will download the content update.
There's new quests and 2 new puzzles. No new achievement, which means the Fall Event isn't included in this update. But I wouldn't be surprised if another CC starts at change of day.
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It's been reported that the Blue key quests did not return at the end of this content update. I'll not be rushing through yet until I know that they come back. I still like using them to break up some monotony, and for Trina's HOS/ZZ combo requests. Kind of like getting a 2fer or even a 3fer so both requests are completed about the same time.
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I haven't started the new story quests yet. I was waiting to see if we received a castle challenge (last year a CC started on Sep 22) so that I could possibly use the story quests to help with the CC tasks.
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Forgot to mention: the update did not correct the Trina quests in my game. Same measly payout. Same disproportionate amount of quests wanting airships.