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Questions like that go [here.](http://www.kongregate.com/forums/1-kongregate)
And why don’t you just click on it and see for yourself?
Alright, I’ll explain it this one time. It’s a challenge in a game. You need to get a special achievement and once you earn it you will be entered automatically. In this particular event there will be multiple challenges, so make sure to [check back.](http://www.kongregate.com/pages/apocalypse-nao)