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I have a problem, i am replaying the game and i have a quest for mikasa saying that i should figure out where she's going on evenings but i can't find her, im not sure if i am supposed to unlock sauna then find here there

Wait did beta come out, the file seems same as the last one, it asks me do i want to download the same file again when i hit download  so im not sure ifi should download it again. Nvm comes out on 13th

What posters? 

When she is in the dorm talking to ymir click on the blue chat box

I can't find Alice at the shrine in the evening

I don't know how to interact with Christa, it says that all i can do for now is watch her sleep. I also can't go in the male dorms for some reason