I'm sorry... It's not a master key but just a key to a front gate for infiltration mission... The first time i got it i think it's a master key... Sorry for the confusion...
And you can only get one or the other but not both... Letter for coming as a guest and key for infiltration...
Ok, now I'm even more lost. What happens in this game seems to be totally random.
I started a brand new save, went through the opening, got hte money from the finance lady, got the guest pass, went into the tower, met the gamer, went into the tower and slept on the 5th(?) floor, woke up outside, went back to finance to sleep again, went back to the tower (with no key, becuase she refused to enter any building) and ran into the weird naked monsters at the tower.
This time I didn't get knocked out/kidnapped and end up locked in a room with the serial-killer dude (even though I did exactly the same things) so I don't have to escape.
Main-character girl refuses to walk around the side of the tower (where I can see two brown enemies) so I went in the front door again.
She refuses to use the elevator. There's a bunch of enemies in the lobby but I ignore them because they respawn as soon as you reenter a tile.
There's a door on the left (which she refuses to use)
There's a door on the right (which she refuses to use)
Tried the stairs, they work. Got to floor two, tried to walk path to the west, she refuses, tried the elevator, she refuses, tried the south path, she refuses.
Went up the stairs again.
Stopped by killer-guy on the stairs, He said some gibberish. Tried all paths on this floor again to see if he unlocked anything (no)
Continued up the stairs trying the elevator and every path (none of which are open) until I hit the 5th floor, where Main-character-girl just refuses to go to the next floor or enter the game's room.
With no other options in the tower, I go back down the tower again, trying every path and door as I go, till I reach the ground floor, try the outside path again, she refuses, try to leave the tower, it works.
Outside the tower, tried to go left, she refuses, tried to go right, she refuses.
Went back into the tower, approached the stairs, she now refuses to go upstairs, but all the other doors are still locks.
So the only fucking route in the game where I could go anywhere (the stairs to the right of the elevator) is now sealed, but as far as I can tell, no new pathways opened up.
Brilliant.
Gonna be honest here.
I don't feel like i'm fighting the enemies, so much as I'm fighting the obstinate fucking main character, who
refuses to go anywhere or fucking do anything.
The game is clearly trying to railroad me somewhere, but it's not goddamn working because the game can't make clear where it wants me to go or what it wants me to do.
Part of that is my fault because I'm playing a game in a language I can't read, but part of it has got to be the game's fault for being the most fucking frustrating fucking moonrunes piece of shit I've played in a long time.
Edit: I had to put her clothes back on before she'd go back upstairs, even though there are still enemies on the next floor that can strip you, so what's the point?
Still, it's hard to feel like I discovered anything, since all I did is regain access to the area i was just in, and I didn't trigger anything since the killer on the stairs, and I already checked everything after speaking to him, so everything should still be the goddamn same.
Edit2: Oh, the games room is unlocked now, despite me being here five minutes ago and it being fucking LOCKED.
Jesus fuck, rooms seem to open and close at total random. I don't understand what sort of goddamn logic this game is supposed to function on.
... I think i'm pretty much playing the game out of spite at this point.
You're trying to help by telling me about the key, but as far as I can tell, I haven't even got that fucking far yet.
So I got to the 6th floor (with all the crates and the enemies) and I got to the elevator, whereupon my character became instantly pregnant(?!) then got teleported into a cell with only a bed and a save-point, and then the game crashed.
Yaaay!
What the fuck?