Check out the patch notes for the v17 Precursor Update here: http://maplestory2.nexon.net/en/news/article/53778/precursor-update-v17
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This trophy is insanity you get this minigame about once an hour because they rotate so I'm going to do the math of just how long it would take you in real time if you showed up to every event every hour.
60 minutes X 10,000 games = 600,000 minutes of real time passing to get this trophy.
600,000 divided by 1440 to get the days = 416.6 days
416.6 divided by 365 to get the years = 1.14 years
So for you to get this trophy you would have to show up every hour of every day for over a year and only play spring beach that's completely unreasonable especially if the other minigames are also like this.